# Real Valued Functions??

• November 8th 2007, 02:23 AM
cu4mail
Real Valued Functions??
Dear All,

I need help to solve these questions: -

Q1. For the real valued function given below
$f(x) = (-x + 9)^3$

Find

$f^{-1} (-1)$

Q2. The real valued functions are given below
$f(x) = 3x^4 - 2x^2$
&
$g(x)=\frac{2}{\sqrt{x}}$, $x \ne 0$

Find gof(x) and gog(x)

• November 8th 2007, 03:27 AM
CaptainBlack
Quote:

Originally Posted by cu4mail
Dear All,

I need help to solve these questions: -

Q1. For the real valued function given below
$f(x) = (-x + 9)^3$

Find

$f^{-1} (-1)$

I presume not only real values but of a real argument, then:

x=10

RonL