Math Is Fun Forum

denis_gylaev

Member

Registered: 2015-03-19

Posts: 66

Graphing Functions Help

ALL EDITED
1)
The graph of y=f(x) is shown in red below. For how many values of c is f(c) = -1?

2) The graph of y=f(x) is shown in red below. Assuming the graph consists of three line segments, what is f(-2)?

3) The graph of y = h(x) is shown in red below. Compute h(h(7)).

4) The graph of $y=f(x)$ is shown below in red. Given that $f$ is invertible, find $f^{-1}(4)$.

Last edited by denis_gylaev (2015-04-25 10:08:04)

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

Re: Graphing Functions Help

hi denis_gylaev

Welcome to the forum.

I have added [img].....[/img] to your http addresses so that the images are imbedded in the page.

These graphs ought to have scales indicated.  I'm guessing that each square represents 1 unit.

Q1.  Draw on the horizontal line y = -1.  Everywhere that it crosses the curve is a value.

Q2.  When x = -2 what is y?  You can estimate the right value but, much better, look at the end points of that line and work out exactly what the y coordinate is.

Q3.  Firstly look at the y coordinate when x = 7.  Now apply the function to that.  ie.  Call that answer the new x coordinate and work out the new y.

Q4.  This time, you're given the y coordinate (y = 4) and they want you to say what the x coordinate is.

Hope that helps.  If you wish, I'll check your answers for you when you post back.

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob