Log in Sujesh Devdassahastrabuddeheshanticurry Ramkrishnabhagawan 7 years agoPosted 7 years ago. Direct link to Sujesh Devdassahastrabuddeheshanticurry Ramkrishnabhagawan's post “Why is it always f(x) and...” Why is it always f(x) and not any other letters? • (12 votes) David Severin 7 years agoPosted 7 years ago. Direct link to David Severin's post “Wait until you get to Alg...” Wait until you get to Algebra 2 when you have to start combining multiple functions, you will start seeing g(x), h(x) etc. In Algebra I, you are just getting used to functional notation, but the power of functional notation over y= form will come later. (20 votes) Sterling Holmes 4 years agoPosted 4 years ago. Direct link to Sterling Holmes's post “I don't understand someth...” I don't understand something. When asked to find f(x), what am I being asked to find? Where do I look to find it? • (6 votes) Chic- Fila 4 years agoPosted 4 years ago. Direct link to Chic- Fila's post “When it says 'f(x)' it is...” When it says 'f(x)' it is generally talking about the y. So when you write an equation like f(x)=2x+3. it in other words is saying y=2x+3. I hope that made some sort of sense... If you want me to explain it in greater detail.. just let me know! <3 (19 votes) lotuswells999 9 years agoPosted 9 years ago. Direct link to lotuswells999's post “How to graph a Parabola” How to graph a Parabola • (5 votes) Aaron Ghosh 2 years agoPosted 2 years ago. Direct link to Aaron Ghosh's post “A Parabola could be graph...” A Parabola could be graphed when given the following skeleton equation: ax^2+bx+c. However, it is not easy to explain how to graph parabolas over comments, so it would be much wiser to follow MyAnchorHolds' suggestion and view the videos on Khan Academy. (6 votes) jsrodriguez 4 years agoPosted 4 years ago. Direct link to jsrodriguez's post “What if the function is f...” What if the function is f(-3) but there’s two points going vertically thru -3 • (7 votes) loumast17 4 years agoPosted 4 years ago. Direct link to loumast17's post “Then it is not a function...” Then it is not a function. A function can only have one y value for every x value. Important to remember there can be multiple x values for a single y value. Kind of confusing but important to remember. if you know it, the vertical line test will tell you if something is a function. (8 votes) Abu Backer Sayeed 8 years agoPosted 8 years ago. Direct link to Abu Backer Sayeed's post “can anyone please tell me...” can anyone please tell me what would be the answer of a) find the value of f(-2) it would be really grateful of you • (7 votes) David Severin 8 years agoPosted 8 years ago. Direct link to David Severin's post “f(x)> x^2 - 5x so by subs...” f(x)> x^2 - 5x so by substitution, (7 votes) rebpap2911 6 years agoPosted 6 years ago. Direct link to rebpap2911's post “I do not get this at all ...” I do not get this at all I have a test in a few days, this is SO complicated. I need some help. PLEASE HELP ME • (6 votes) shaposhnikovd 3 years agoPosted 3 years ago. Direct link to shaposhnikovd's post “I know this isn't really ...” I know this isn't really a fast answer, but, (4 votes) acealena 4 years agoPosted 4 years ago. Direct link to acealena's post “Can I write the function ...” Can I write the function as f=x+1? • (4 votes) Neil 4 years agoPosted 4 years ago. Direct link to Neil's post “My answer: kinda. You can...” My answer: kinda. You can write it like that, and it is technically correct, but it is common practice to either write it in: y=mx+b or f(x)=mx+b. (6 votes) Dallin Smith a year agoPosted a year ago. Direct link to Dallin Smith's post “Sal Khan is smart, so why...” Sal Khan is smart, so why is the line all spaghetti like. • (5 votes) Bani Hundal a year agoPosted a year ago. Direct link to Bani Hundal's post “This is hand drawn, so th...” This is hand drawn, so this is not that perfect though he's smart. (4 votes) Scott, Claire a year agoPosted a year ago. Direct link to Scott, Claire's post “why is the line in such a...” why is the line in such a weird shape • (4 votes) Kim Seidel a year agoPosted a year ago. Direct link to Kim Seidel's post “Likely because Sal wanted...” Likely because Sal wanted to show you a non-typical function. (4 votes) Kitkat100 6 months agoPosted 6 months ago. Direct link to Kitkat100's post “I am just trying to learn...” I am just trying to learn how to turn a graph into a function. That's all. So why didn't they explain dis better? HELP ME! Can someone tell me how to turn a graph into a function? • (3 votes) Kim Seidel 6 months agoPosted 6 months ago. Direct link to Kim Seidel's post “You need to provide more ...” You need to provide more info... (5 votes)Want to join the conversation?
f : x > x^2 -5x
b) find the value of ff(2)
c) find the range of f if domain is {-1, 0, 1}
a) f(-2) > (-2)^2 - 5(-2) 4 - (- 10) = 14
f(-2)> 14
b) f(2) > (2)^2- 5(2) 4-10 = -6
f(2) > -6
c) f(-1) > (-1)^2 -5(-1) f(-1)> 6
f(0) > 0^2 - 5(0 f(0) > 0
f(1) = (1)^2 -5(1) f(1) > -4
I have not seen this type of problem with limited domain with inequality, but
since the range is the f(x),
my best guess on how to write it would be {f(x)>6, f(x)>0, f(x)>-4}
And please answer fast
basically he is just saying that when the x coordinate is at -1, the y coordinate is 6 on the line.
He just wants you to find out the y coordinate by using the line, when x (F) is given to you.
Reply if you actually read this. you probably already got it, but ill write this anyway.
Hope that helps!
1) Are you asking how you determine if the graph is/isn't a function? The graph either is or isn't a function already. Use the vertical line test to determine if the graph is a function. If you can draw a vertical line anywhere in the coordinate plane and the line only crosses the graph once, then the graph is a function.
2) Or, are you being asked to create the equation that would create the graph and then show the equation in function notation? If this is what you were asked to do, you need to know what type of graph you have: linear, quadratic, polynomial, exponential, etc. Each have different techniques for creating an equation from the graph. Once you know the type of graph, you can use the search bar to find lessons on writing equations of that type.
FAQs
What is the example given of evaluating functions? ›
Example: Evaluating Functions
Given the function h(p)=p2+2p h ( p ) = p 2 + 2 p , evaluate h(4) . To evaluate h(4) h ( 4 ) , we substitute the value 4 for the input variable p p in the given function. Therefore, for an input of 4, we have an output of 24 or h(4)=24 h ( 4 ) = 24 .
“A function is a rule that assigns each input exactly one output. They occur when every x-value is associated with exactly one y-value.” You are also probably very familiar with the vertical line test.
How do you evaluate points on a graph? ›The y-coordinate of a point is the value that tells you how far from the origin the point is on the vertical, or y-axis. To find the y-coordinate of a point on a graph: Draw a straight line from the point directly to the y-axis. The number where the line hits the axis is the value of the y-coordinate.
How to evaluate f(o) on a graph? ›To evaluate f(0) means to find the output of the function when the input is 0. To do this, find the point on the graph that has an x-value of zero. This will be the place where the graph crosses the y-axis. For this function an input of 0 produces an output of 1.
How do you determine a function from a graph? ›You can use the vertical line test on a graph to determine whether a relation is a function. If it is impossible to draw a vertical line that intersects the graph more than once, then each x-value is paired with exactly one y-value. So, the relation is a function.
What are examples of evaluating? ›Examples of evaluate
Of course a teacher can be evaluated by looking at student growth. The people are very committed to evaluating each case on a case-by-case basis. She evaluated my personality and broke it down into 41 different traits, out of a total of 52 that she measures.
The three main types of evaluation methods are goal-based, process-based and outcomes-based. Goal-based evaluations measure if objectives have been achieved (We highly recommend S.M.A.R.T. Goals). Process-based evaluations analyze strengths and weaknesses.
What is the first step in evaluating functions? ›Answer: To evaluate a function, substitute the input (the given number or expression) for the function's variable (place holder, x). Replace the x with the number or expression. Given the function f (x) = 3x - 5, find f (4). ...
What is an example of a function in math? ›For instance, if x = 3, then f(3) = 9. A few more examples of functions are: f(x) = sin x, f(x) = x2 + 3, f(x) = 1/x, f(x) = 2x + 3, etc.
What is the formula for function? ›The notation y=f(x) defines a function named f. This is read as “y is a function of x.” The letter x represents the input value, or independent variable. The letter y, or f(x), represents the output value, or dependent variable.
How to tell if an equation is a function? ›
For an equation to be a function make sure each value of x must give one and only one value of y. If any value of x ( x is in domain of function ) give more than one value of y, then the equation is not function. best method is of-course to find a few value of y for x draw graph and perform a vertical line test.
What is the domain and range of a function? ›The domain of a function is the set of values that we are allowed to plug into our function. This set is the x values in a function such as f(x). The range of a function is the set of values that the function assumes. This set is the values that the function shoots out after we plug an x value in.
How do you analyze a function graph? ›- Identify the common features of a function when given an equation or graph.
- Analyze domain and range of the function.
- Analyze maximum and minimum values of the function.
- Understand axes of symmetry of the function.
- Analyze end behaviors of the graphs.
To evaluate a function, substitute the input (the given number or expression) for the function's variable (place holder, x). Replace the x with the number or expression.
How do you evaluate if an equation is a function? ›Generally, the test is whether you can solve for one of the variables in terms of the others, in such a way that that variable has only one value if the others are fixed; then you can say that it defines that first variable "as a function of" the others.
How do you evaluate each function in function notation? ›Functions can be evaluated at values and variables. To evaluate a function, substitute the values for the domain for all occurrences of x. To evaluate f(2) in f(x) = x + 1, replace all x's with 2 and simplify: f(2) = (2) + 1 = 3. This means that f(2) = 3.