diket f(x)=x²+2x-13 dan g(a)=5x-2 jika g(n)=18 maka nilai f(n)

Materi : Fungsi Kuadrat

Pembahasan :
g(x) = 5x - 2

g(n) = 5n - 2
18 = 5n - 2
5n = 20
n = 4

Maka...
f(n) = f(4)
= 4² + 2(4) - 13
= 16 + 8 - 13
= 24 - 13
= 11