已知a^2+2a-1=0,则2x^2+4a-3=

问题描述:

已知a^2+2a-1=0,则2x^2+4a-3=

a^2+2a-1=0
a²+2a=1
2a^2+4a-3
=2(a²+2a)-3
=2-3
=-1