解方程x(3x-4)-7=2(x^2-2)+2x

2024-12-04 13:45:14
推荐回答(4个)
回答1:

x(3x-4)-7=2(x^2-2)+2x
解:去括号得3x^2-4x-7=2x^2-4+2x
移项合并同类项得x^2-6x-3=0
配方得:(x-3)^2=12
两边同时开方得:x-3=±√12
x=3+2√3 或 x=3-2√3

回答2:

x(3x-4)-7=2(x²-2)+2x
3x²-4x-7=2x²-4+2x
x²-6x=3
x²-6x+9=3+9
(x-3)²=12
x1=3+2√3 x2=3-2√3

回答3:

解:3x²-4x-7=2x²-4+2x
x²-6x-3=0
﹙x-3﹚²=12
x-3=±√12
x1=3+2√3
x2=3-2√3.

回答4:

答案是:x+2x^2=7