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[Leesygirl]

If f(x) = 4x - 3 and g(x) = 2x + 2, find the value of:

a. f(-1)
b. g(0)
c. f(2)
d. f^-1(x)
e. fg(x)
f. gf(x)
g. If f(x) = 5, find x

 

[Deleted member 4993]

If f(x) = 4x - 3 and g(x) = 2x + 2, find the value of:

a. f(-1)
b. g(0)
c. f(2)
d. f^-1(x)
e. fg(x)
f. gf(x)
g. If f(x) = 5, find x

You have posted 3 problems - without showing a line of work.

http://www.freemathhelp.com/forum/threads/86602-Help-please!

http://www.freemathhelp.com/forum/threads/86621-Help-me-please

Please share your work with us ...

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/th...Before-Posting

 

[stapel]

If f(x) = 4x - 3 and g(x) = 2x + 2, find the value of:

a. f(-1)

Plug -1 in for x in the function f(x). Simplify. (This is called "function evaluation".)

b. g(0)

Plug 0 in for x. Simplify.

c. f(2)

Plug 2 in for x. Simplify.

d. f^-1(x)

Have you learned yet how to find inverse functions? If not, you can learn here.

e. fg(x)
f. gf(x)

Are these written as you've posted, so you're just multiplying (as an operation on two functions), or was there a floating open circle between the f and the g, so you're composing the two functions?

g. If f(x) = 5, find x

Plug 5 in for f(x). Solve for x.