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f(-3) = -3a+b = -15
f(3) = 3a+b = 9
Kurangi, didapat :
-6a = -24, sehingga a = 4
3a + b = 9
3.4 + b = 9
12 + b = 9
b = -3
Jadi, f(x) = ax+b = 4x-5
Maka,
f(-2)+f(2) = 4(-2)-5 + 4.2-5 = -8-5+8-5 = -13+3 = -10