问题
填空题
分解因式:(x+2)(x+4)+x2-4=______.
答案
(x十2)(x+4)十x2-4,
=x2十6x+8十x2-4,
=2x2+6x+4,
=2(x2+3x+2),
=2(x+2)(x+1).
分解因式:(x+2)(x+4)+x2-4=______.
(x十2)(x+4)十x2-4,
=x2十6x+8十x2-4,
=2x2+6x+4,
=2(x2+3x+2),
=2(x+2)(x+1).