若x2+ax+b=(x+3)(x-4),则a=_,b=_.
问题描述:
若x2+ax+b=(x+3)(x-4),则a=______,b=______.
答
∵(x+3)(x-4),
=x2-x-12,
=x2+ax+b,
∴a=-1,b=-12.