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p(1) = 20
p(x) = ( x-1 ) ( x-2 ) ( x+1 ) Q(x) + ax+b
p(-1) = -a + b =10
p(1) = a + b = 20
-a + b = 10
a + b = 20 +
2b = 30
b = 15
a +b = 20 ⇒ a = 20-15 = 5
s(x) = ax + b = 5x + 15
s(2) = 5(2) + 15 = 10 + 15 = 25
Maka, sisa pembagian f(x) di bagi (x-2) adalah 25