Question

Find g(f(x)) when f(x) = 3x2 + x - 8, and g(x) = 4x + 5.

Answer 1

if (f(x))=
$3 \times 2 + x - 8 \\ 6 + x - 8 \\ x - 2$

we also write (f(x))=2
therefore,=x-2
2=x
so put the value of x in g(x),so the answer will be ,
$4x + 5 \\ 4 \times 2 +5 \\ 8 + 5 \\ 13$
so the answer will be 13