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f(-3) = -15 --> -3a+b = -15
f(3) = 9 --> 3a+b = 9 +
2b = -6
b = -3
3a+b = 9
3a+(-3) = 9
3a = 12
a = 4
f(x) = 4x-3
f(-2)+f(2) = 4.(-2)-3 + 4.2-3
= -8-3 + 8-3
= -6
semoga membantu ya ^_^
a = 4
b = -3
f(-2) = -2.4 -3 = -11
f(2) = 2.4 +3= 11
jadi = -11 + 11 = 0