bantu ya pkek jalannya

[tex](g(f(x))) = 4 {x}^{2} + 4x \\ misal \: f(x) = a \\ (g(a)) = 4 {x}^{2} + 4x \\ {a}^{2} - 1 = 4 {x}^{2} + 4x \\ {a}^{2} = 4 {x}^{2} + 4x + 1 \\ {a}^{2} = {(2x + 1)}^{2} \\ a = 2x + 1 \\ jadi \: f(x) = 2x + 1[/tex]