Question

Phân tích đa thức thành nhân tử

A) 5a^2-5ax-7a+7x

B) a^3+a^2b-a^2c-abc

C) x^2-(a+b).x+ab

D) a^3+b^3+a^2c+b^2c-abc

Answer 1

a) \(5a^2-5ax-7a+7x\)

\(=5a\left(a-x\right)-7\left(a-x\right)\)

\(=\left(5a-7\right)\left(a-x\right)\)

Answer 2

c) \(x^2-\left(a+b\right).x+ab\)

\(=x^2-ax-bx+ab\)

\(=x\left(x-a\right)-b\left(x-a\right)\)

\(=\left(x-b\right)\left(x-a\right)\)

Answer 3

a,\(5a^2-5ax-7a+7x=5a\left(a+x\right)-7\left(a+x\right)=\left(a+x\right)\left(5a-7\right)\)