a^6-7a^3b^3-8b^6
=(a^3-8b^3)(a^3+b^3)
=(a-2b)(a^2+2ab+4b^2)(a+b)(a^2-ab+b^2)
6a^4-5a^3-4a^2
=a^2(6a^2-5a-4)
=a^2(2a+1)(3a-4)
4a^6-37a^4b^2+9a^2b^4
=a^2(4a^4-37a^2b62+9b^2)
=a^2(4a^2-1)(a^2-9b^2)
=a^2(2a-1)(2a+1)(a-3b)(a+3b)
(x^2+x)^2-17(x^2+x)+60
=(x^2+x-12)(x^2+x-5)
=(x+4)(x-3)(x^2+x-5)
(x^2+2x)^2-7(x^2+2x)-8
=(x^2+2x-8)(x^2+2x+1)
=(x+4)(x-2)(x+1)^2
(2a+b)²-14（2a+b）+48
=(2a+b-6)(2a+b-8)