Question

（x²+x)²-26(x²+x)+120 ax+ay+bx+by-a-b x²(

Answer 1

（x²+x)²-26(x²+x)+120

=(x²+x-6)(x²+x-20)

=(x+3)(x-2)(x+5)(x-4)

ax+ay+bx+by-a-b

=a(x+y)+b(x+y)-(a+b)

=(a+b)(x+y)-(a+b)

=(a+b)(x+y-1)

x²(x²-y²)-72y⁴

=x⁴-x²y²-72y⁴

=(x²+8y²)(x²-9y²)

=(x²+8y²)(x+3y)(x-3y)