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f(3) = 3a + b = 9
_______________ -
-6a = -24
a = 4
maka
3a + b = 9
b = 9-12
b = -3
nah udah ketauin kan a sama b nya.. coba kerjain sendiri dulu f(-2) + f(2) nya ya.. kalau ga ngerti boleh nanya