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

[tex]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[/tex]
[tex]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[/tex]