Question

Diketahui fungsi f:x 1/2 (3-x) . tentukan :
Rumus fungsi f
Nilaifungsi f, jika=1 dan x=7
Nilai a, jika f(a)=5

Answer 1

Rumus fungsi f: f(x) = 1/2 (3 - x)

Nilai fungsi f, jika x = 1 dan x = 7:
f(1) = 1/2 (3 - 1) = 1/2 * 2 = 1
f(7) = 1/2 (3 - 7) = 1/2 * (-4) = -2

Nilai a jika f(a) = 5
f(a) = 1/2 (3 - a)
5 = 1/2 (3 - a)
5 * 2 = 3 - a
10 = 3 - a
a = 3 - 10
a = -7