急!分解公因式:(X+2)(X+3)+X^2-9
问题描述:
急!分解公因式:(X+2)(X+3)+X^2-9
答
(x+2)(x+3)+(x+3)(x-3)
=(x+3)(x+2+x-3)
=(x+3)(2x-1)
答
我答错了
答
=X^2+5X+6+X^2-9
=2*X^2+5X-3
=(2X-1)(X+3)