x^2-3ax-6ab-4b^2因式分解是多少

问题描述:

x^2-3ax-6ab-4b^2因式分解是多少

x^2-3ax-6ab-4b^2
=x^2-4b^2 -3ax-6ab
=(x+2b)(x-2b)-3a(x+2b)
=(x+2b)(x-2b-3a)