Question

f(x)=x-3 and g(x)=4x²-3x-9 fine (Gof)(x)

Answer 1

$x - 3 = 0 \\ x = 3 \\ \\ 4 {x}^{2} - 3x - 9 \\ \\ 4 {(3)}^{2} - 3(3) - 9 \\ \\ 4(9) - 9 - 9 \\ 36 - 18 \\ 18$