(2x+3y-3)(2x+3y+7)-11
=(2x+3y)^2-4(2x+3y)-32
=[(2x+3y)-8]*[(2x+3y)+4]
=(2x+3y-8)(2x+3y+4)
4x^2-12xy+9y^2-2x+3y-6
=(2x-3y)^2-(2x-3y)-6
=[(2x-3y)-3]*[(2x-3y)+2]
=(2x-3y-3)(2x-3y+2)
x^2+3ax-10a^2-x+2a
=x^2+(3a-1)x-10a^2+2a
=x^2+(3a-1)x-2a(5a+1)
=(x+5a-1)(x-2a)
(x^2-7x+6)(x^2-x-6)+56
=(x-6)(x-1)(x-3)(x+2)+56
=[(x-6)(x+2)][(x-1)(x-3)]+56
=(x^2-4x-12)(x^2-4x+3)+56
=(x^2-4x)^2-9(x^2-4x)-36+56
=(x^2-4x)^2-9(x^2-4x)+20
=(x^2-4x-4)(x^2-4x-5)
=(x^2-4x-4)(x-5)(x+1)
2x^2-3x-9
=(2x+3)(x-3)
3y^2+11y+10
=(y+2)(3y+5)
(ax+by)^2+(bx-ay)^2
=a^2x^2+b^2y^2+2abxy+b^2x^2+a^2y^2-2abxy
=a^2x^2+b^2y^2+b^2x^2+a^2y^2
=a^2(x^2+y^2)+b^2(x^2+y^2)
=(a^2+b^2)(x^2+y^2)
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