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f(0)=4> a(0)+b =4
b =4
f(-2)=8>a(-2)+4=8
-2a =8-4
-2a =4
a =4/-2
a =-2
a+b = (-2)+4 = 2
=> F(0) = 4
a(0)+b = 4
b=4 (i)
=> F(-2) = 8
a(-2)+b = 8
-2a+b = 8 (ii)
subtitusikan hasil (i) ke (ii)
-2a+b = 8
-2a+4 = 8
-2a = 4
a= -2
jadi a+b = -2+4 = 2