1.2y^2+y-6
=(2y-3)(y+2)
2.6x^2-13x+6
=(3x-2)(2x-3)
3.3a^2-7a-6
=(3a+2)(a-3)
4.x^4-10x^2+9
=(x^2-1)(x^2-9)
=(x+1)(x-1)(x+3)(x-3)
5.7x^3-5x^2-2x
=x(7x^2-5x-2)
=x(7x+2)(x-1)
6.(a^2+8a)^2+22(a^2+8a)+120
=(a^2+8a+10)(a^2+8a+12)
=(a^2+8a+10)(a+2)(a+6)
不知
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