计算(x+3)(x-2)+(x-3)(x+2)得( ) A.2x2+12 B.2x2-12 C.2x2+x+12 D.2x2-x-12
问题描述:
计算(x+3)(x-2)+(x-3)(x+2)得( )
A. 2x2+12
B. 2x2-12
C. 2x2+x+12
D. 2x2-x-12
答
原式=x2-2x+3x-6+x2+2x-3x-6=2x2-12.
故选B.