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f(-2) = -1
suku banyak = pembagi x hasil bagi + sisa
f(x) = (x²+x-2).h(x) + ax+b
(x+2)(x-1)
f(1) = a+b = 5
f(-2) = -2a+b = -1 _
3a = 6
a = 2
2+b = 5
b = 5-2
b = 3
sisa: ax+b
jadi sisanya 2x+3