用配方法解一元二次方程x2+4x–5=0,此方程可变形为( )
A.(x + 2)2 = 9 | B.(x- 2)2 = 9 |
C.(x + 2)2 = 1 | D.(x - 2)2 =1 |
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用配方法解一元二次方程x2+4x–5=0,此方程可变形为( )
A.(x + 2)2 = 9 | B.(x- 2)2 = 9 |
C.(x + 2)2 = 1 | D.(x - 2)2 =1 |
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