f(x) = 3x-4
f(a) = 3a-4
8 = 3a-4
12=3a
a = 4
f(-4) = 3.-4 -4
b = -12-4
b= -16
a+b= 4-16 = -12
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f(x) = 3x-4
f(a) = 3a-4
8 = 3a-4
12=3a
a = 4
f(-4) = 3.-4 -4
b = -12-4
b= -16
a+b= 4-16 = -12
f(a)=8
f(-4)=b
maka,
f(a)=3a-4=8
3a=8+4
3a=12
a=4
f(-4)= 3.(-4)-4=b
-16=b
Nilai a+b=4+(-16)=-12