jika f(2x+6)=4x^2+2x tentukan f(×)

Bab Fungsi

Misalkan
2x + 6 = a
Maka
x = (a - 6)/2

f(2x + 6) = 4x^2 + 2x
f(a) = 4((a - 6)/2)^2 + 2((a - 6)/2)
f(a) = 4((a^2 - 12a + 36)/4) + (a - 6)
f(a) = (a^2 - 12a + 36) + a - 6
f(x) = x^2 - 11x + 30