当y=?时,代数式y^2+7y+3和y-2的值相等

当y=?时,代数式y^2+7y+3和y-2的值相等
当y=?时,代数式y^2+7y+3和y-2的值相等

当y=?时,代数式y^2+7y+3和y-2的值相等
y^2+7y+3=y-2,
y^2+6y+5=0,
(y+1)(y+5)=0
y1=-1,y2=-5
当y=-1.-5时,代数式y^2+7y+3和y-2的值相等

-1 ,-5