化简求值(x加1)乘(2x减1)减(x减3)的方,其中x等于负2

(x+1)(2x-1)-(x-3)²
=(2x²-x+2x-1)--(x²-6x+9)
=2x²+x-1-x²+6x-9
=x²+7x-10
=(-2)²+7×(-2)-10
=4-14-10
=-20