若x²+ax+b=(x+5)(x-6),则a=_____b=_____.
问题描述:
若x²+ax+b=(x+5)(x-6),则a=_____b=_____.
答
(x+5)(x-6)
=x²-6x+5x-30
=x²-x-30
所以a=-1,b=-30