Question

Can someone please explain this

Answer 1

Answer: x=-3-
`√(7)` or x=-3+
`√(7)`

Explanation:

f(x)=x+1. g(x)=x+5

(f * g)(x)=

f(x)*g(x)=

(x+1)(x+5)=

x^2+5x+x+5=x^2+6x+5

x^2+6x+5=3

x^2+6x+9=7 ==> Add 4 on both sides of the equation

(x+3)^2=7

x+3=
`√(7)`

x=-3+
`√(7)`

x+3=-
`√(7)`

x=-3-
`√(7)`