Question

Diketahui rumus fungsi f(x) = 6-2x.Jika f(a)=-4 dan f(-1)=b, nilai a-b =

Answer 1

F(a)=6-2a=-4
-2a=-10
a=5

f(-1)=6-2(-1)=b
         6+2=b
         9=b
a-b
5-9
-4

Answer 2

F(x) = 6 - 2x
f(a) = 6 - 2a
-4. = 6 - 2a
-4-6 = -2a
-10 = -2a
a = 5

f(-1) = 6-2(-1)
b. = 6+2
= 8
a- b = 5-8
= -3