若代數(shù)式4x2-2x-5與2x2+1的值互為相反數(shù),則x的值是_.
若代數(shù)式4x2-2x-5與2x2+1的值互為相反數(shù),則x的值是______.
優(yōu)質(zhì)解答
∵代數(shù)式4x
2-2x-5與2x
2+1的值互為相反數(shù),
∴4x
2-2x-5+2x
2+1=0,即(x-1)(3x+2)=0,
解得x=1或-
.
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