Question

how bout this.... f(x)=x^2+x and g(x)=2x+1 find g^-1(x)

Answer 1

means, find the inverse of g(x)

Answer 2

\[g^{-1} = -\frac{1}{2x}\]

Answer 3

Just making the form look better

Answer 4

how do i simplify that

Answer 5

Simplify? Why would you try to simplify that?

Answer 6

and wat if it says g^-1(5)

Answer 7

Then replace x with 5 and evaluate

Answer 8

yes irinka just plug in the value of x if it is given on x

Answer 9

replace x with 5, then evaluate. Don't be confused.

Answer 10

so the answer would be\[g ^{-1}=\left(\begin{matrix}-1 \\ 10\end{matrix}\right)\]

Answer 11

ok and (f o g)(2) would be 30?

Answer 12

is that correct?

Answer 13

what is f o g ?

Answer 14

the equaion on the very top...simplify for f of g

Answer 15

ok

Answer 16

it means f*g
(x^2+1) * (2x+1)
2x^3 + x^2 + 2x + 1
2x^3 + x^2+2x+1 is the answer

Answer 17

irinka 17, you should clarify your question. If it is a separate question, post it as a separate question.

Answer 18

i did

Answer 19

11minutes ago