Question

Diketahui rumus fungsi f(x)=4x-12. jika f(a)=8 dan f(-2)=b,maka nilai a+b adalah?

Answer 1

F(a) = 4a - 12
8 = 4a - 12
20 = 4a
5 = a
f(-2) = 4.(-2) - 12
b = -8 - 12
b = -20
a + b = 5 - 20
= -15

Answer 2

F (x) = 4x - 12

f (a) = 4a -12 = 8
4a = 20
a = 5
f (-2) = 4 . (-2) - 12= b
= -8 - 12 = b
= -20 = b

a + b = 5 + (-20)= -15