Question

PLS PLS HELP!!!!!!

Let f(x)=x^2 + 5 and g(x)=x+5/x find (g°f)(-3)

A. 1/4

B. 14/19

C. 19/14

D. 49/9

Answer 1

C

Explanation:

Okay, so for this, you need to know that (g°f)(x) = g(f(x))

in order words, we are using the f(x) equation as X for the g(x) equation..

`( x^(2) +5 + 5)/( x^(2) +5)` =
`(x^(2)+10)/(x^(2)+5)`

Now, we just plug in -3 for X

`((-3)^(2) + 10 )/((-3)^(2) + 5) =(9 + 10)/(9 + 5) = (19)/(14)`

C