Tentukanlah f (x) jika diketahui f (4-2x) = 5x + 3

Bab Fungsi

Misalkan
4 - 2x = a
-2x = a - 4
x = (a - 4)/-2
x = (4 - a)/2

f(4 - 2x) = 5x + 3
f(a) = 5((4 - a)/2) + 3
f(a) = 2,5(4 - a) + 3
f(x) = 10 - 2,5x + 3
f(x) = 13 - 2,5x