6x²-11xy+3y²
2 -3
3 -1
=(2x-3y)(3x-y)
6(x+y)²-11(x+y)(x-y)+3(x-y)²
2 -3
3 -1
=(2x+2y-3x+3y)(3x+3y-x+y)
=(-x+5y)(2x+4y)
16 x^4-17x²+1
1 -1
16 -1
=(x^2-1)(16x^2-1)
=(x+1)(x-1)(4x+1)(4x-1)
9x的四次方-13x²y²+4y的四次方
1 -1
9 -4
=(x+y)(x-y)(3x-2y)(3x+2y)
5+7(a+1)-6(a+1)²
=-[6(a+1)²-7(a+1)-5]
2 1
3 -5
=-(2a+2+1)(3a+3-5)
=-(2a+3)(3a-2)