Tolong cepat ya, terima kasih nomer 3 dan 4 sama cara ya

Tolong cepat ya, terima kasih nomer 3 dan 4 sama cara ya

Jawaban Terkonfirmasi

$3). : (gof)(x) = {x}^{2} + 4x + 1 \ (g(f(x)) = {x}^{2} + 4x + 1 \ 3(f(x)) - 2 = {x}^{2} + 4x + 1 \ 3.f(x) = {x}^{2} + 4x + 3 \ f(x) = frac{1}{3} {x}^{2} + frac{4}{3} + 1$
$4.a) : y = 4 {x}^{2} + 16x - 18 \ x = 4 {y}^{2} + 16y - 18 \ x + 18 = 16( frac{1}{4} {y}^{2} + y) \ frac{1}{4} {y}^{2} + y = frac{x + 18}{16} \ {y}^{2} + 4y = frac{x + 18}{4} \ {(y + 2)}^{2} = frac{x + 18}{4} - 4 = frac{x + 2}{4} \ y = sqrt{ frac{x + 2}{4} } - 2$