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f(-3)= -3a+b=11
----------------------- -
4a = -8
a = -2
b= 5
(D)
f(1)=a.1+b
3 =a+b
f(-3)=a.-3+b
11=-3a+b
3 =a+b
11=-3a+b
dikurangkan
-8=4a
A=-8:4=-2
B=a=-2
3=a+b
3=-2+b
3+2=b
B=5
jadi,jawabanya adalah -2 dan 5 (D)