Question

7(a-1)+x(a-1),3（a-b）²+6（b-a）,2（m-n）²-m（m-n）,x（x-y）

Answer 1

7(a-1)+x(a-1)

=(7+x)(a-1)

3(a-b)²+6(a-b)

=(a-b)(3(a-b)+6)

=(a-b)(3a-3b+6)

2(m-n)²-m(m-n)

=(m-n)(2(m-n)-m)

=(m-n)(2m-2n-m)

=(m-n)(m-2n)

x(x-y)²-y(y-x)²

=x(x-y)²-y(x-y)²

=(x-y)²(x-y)

m(a²+b²)+n(a²+b²)

=(a²+b²)(m+n)