3x^2+10x-8=0
3(x+ 5/3)^2 =49/3
(x+ 5/3)^2 =49/9
x+5/3 = 7/3 or -7/3
x= 2/3 or -4
追问
要是这样算对不,详细解一下,好不,谢谢!
追答你那个不对
3x^2+10x-8=0
3(x^2 + (10/3)x ) = 8
3[x^2 + (10/3)x + (5/3) ^2 ] = 8 + 25/3
3(x+ 5/3)^2 = 49/3
(x+ 5/3)^2 = 49/9
x+ 5/3 = 7/3 or -7/3
x= 2/3 or -4
追问好吧
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