Question

因式分解：9x的平方-y的平方-6x+1 a的平方-2ab+b的平方-4

Answer 1

9x^2-y^2-6x+1

=(9x^2-6x+1)-y^2

=(3x-1)^2-y^2

=(3x-1+y)(3x-1-y)

a^2-2ab+b^2-4

=(a-b)^2-4

=(a-b+2)(a-b-2)