1. ## Please, just a little help?

Hello!

I just need a little help with the next few problems. I keep getting these type wrong and it's a little frustrating. Any help is appreciated. Thanks, so so much.

A. given: f(x)=$\displaystyle (x+5)/x$ and g(x)=$\displaystyle x^2-3$, find (g o f)(-9)

B. simplify the following:

7 + __b____
.......7 + __7__
.................7 + b

The ..... are just for spacing. I know thats a rough picture but I think you get the point? Thanks.

2. Originally Posted by cantinalou
Hello!

I just need a little help with the next few problems. I keep getting these type wrong and it's a little frustrating. Any help is appreciated. Thanks, so so much.

A. given: f(x)=$\displaystyle (x+5)/x$ and g(x)=$\displaystyle x^2-3$, find (g o f)(-9)

B. simplify the following:

7 + __b____
.......7 + __7__
.................7 + b

The ..... are just for spacing. I know thats a rough picture but I think you get the point? Thanks.
A) $\displaystyle (g\circ{f})(x)=g[f(x)]=[f(x)]^2-3=\left(\frac{x+5}{x}\right)^2-3$

So, now just evaluate at -9.