Prove that if a ne b and if (x−a) and (x−b) divide f(x), then (x−a)(x−b)∣f(x)

Bellenik3

Bellenik3

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2022-08-24

Prove that if a b and if ( x a ) & ( x b ) divide f(x), then ( x a ) ( x b ) f ( x )

Answer & Explanation

hyttnp

hyttnp

Beginner2022-08-25Added 4 answers

By the division algorithm for polynomials, there exists some g(x) and some h(x) of degree at most 1 such that
f ( x ) = g ( x ) ( x a ) ( x b ) + h ( x ) .
We see, by letting x=a in this relation, that h(a)=0. Similarly, h(b)=0. Since h is linear with two roots, h 0

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