Question

Please help. I've been working on this for hours/:
Let f(x)=x^2+6 and g(x)=(x+8)/x. Find (g o f)(-7)
a) -55/7
b) 384/7
c) 295/49
d) 63/55
ANY help would be VErY much appreciated .(:

Answer 1

find f(7) first then what you get for that you put it in as x of g(x)

Answer 2

\[f(-7)=(-7)^2+6=55\] now find \(g(55)\)

Answer 3

\[g(55)=\frac{55+8}{55}\] etc

Answer 4

Wait what? I'm confused.....

Answer 5

Plut -7 into the f(x) function first.

Answer 6

Ok. so f(-7)=(-7)^2+6=55 rigt?

Answer 7

yes, not you take the 55 and put it into the g(x) function

Answer 8

So it's g(55)=(55+8)/x

Answer 9

good, but also put 55 in for the x on the bottom.

Answer 10

Oh right. My bad. So g(55)=(55+8)/55 = g(55)=63/55 ?

Answer 11

there you go

Answer 12

So the answer is 63/55?

Answer 13

yes

Answer 14

Thank you so much!!

Answer 15

Would you be able to help me with one more?

Answer 16

i can try