## Want to join the conversation?

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.

(18 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*(18 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.

(5 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.

(7 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

f : x > x^2 -5xa) find the value of f(-2)

b) find the value of ff(2)

c) find the range of f if domain is {-1, 0, 1}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,

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}(6 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

And please answer fast•

(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,

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.(3 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.

Hope that helps!(5 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.

(3 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.

(3 votes)

Kitkat100

5 months agoPosted 5 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

5 months agoPosted 5 months ago. Direct link to Kim Seidel's post “You need to provide more ...”

You need to provide more info...

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.(4 votes)