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For the cubic expression P(x) where the coefficient of x^3 is 1, when P(1)=1, P(2)=3, P(3)=5, when P(x) is divided by x-4, the remainder calculate
P(1),P(2),P(3) increased to 1,3,5 -> 2x-1
P(x)=Q(x)+2x+1
where Q(x) must be divided by (x-1), (x-2), (x-3) (must have it as an argument)
However, since it is a cubic formula, it can be expressed as a product of (x-1), (x-2), (x-3).
P(1),P(2),P(3)이 1,3,5로 증가 -> 2x-1
P(x)=Q(x)+2x+1
여기서 Q(x)는 (x-1),(x-2),(x-3)으로 나누어져야함(인수로 가지고 있어야함)
그런데 삼차식이므로 (x-1),(x-2),(x-3)의 곱으로 나타낼 수 있음.
https://blog.naver.com/hanjin0322/222598868746
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