x2+4x-5与2-2x是互为相反数,则x的值为_.
问题描述:
x2+4x-5与2-2x是互为相反数,则x的值为______.
答
∵x2+4x-5与2-2x是互为相反数,
∴x2+4x-5+2-2x=0,
∴x2+2x-3=0,
∴(x-1)(x+3)=0,
解得x=-3或x=1.
故答案为-3或1.