## Brooke2013 Group Title Let f(x) = x^2 + 6 and g(x) = x+8/x. Find (g times f)(-7) Choices :) A.) -55/7 B.) 384/7 C.) 295/49 D.) 63/55 2 years ago 2 years ago

1. zepdrix

Are you sure it's "times", or is it the open circle? Which tells us that it's a composition of functions :D

2. Brooke2013

It's an open circle, I looked at it wrong.

3. zepdrix

|dw:1353198866293:dw| Ok take a look at this a sec, see if it makes sense or not.. so hmmm to finish this off, we'll need to figure out what f(-7) is.

4. Brooke2013

How do you figure that out ?

5. zepdrix

$\large f(x)=x^2 + 6$$\huge f(-7)=(-7)^2+6$

6. Brooke2013

so the answer to f(-7) is 55

7. zepdrix

Yah looks good c: So now we plug that value into g!

8. Brooke2013

9. zepdrix

$f(-7)=55$$\huge g(f(-7))=\frac{ f(-7)+8 }{ f(-7) }=\frac{ 55+8 }{ 55 }$

10. Brooke2013

So the answer is D 63/55 :) Thank you so much

11. zepdrix

yay team :D