题目内容
方程4x2+4x-1=0的两根为x1=
,x2=
,则把二次三项式4x2+4x-1因式分解,结果应是 ( )
-1+
| ||
2 |
-1-
| ||
2 |
A.(x+
| B.2(2x+1+
| ||||||||||||
C.(x+1+
| D.(2x+1+
|
因为方程4x2+4x-1=0的两根为x1=
,x2=
,
所以4x2+4x-1=4(x-
)(x-
)
=2(x-
)•2(x-
)
=(2x+1-
)(2x+1+
).
故选D.
-1+
| ||
2 |
-1-
| ||
2 |
所以4x2+4x-1=4(x-
-1+
| ||
2 |
-1-
| ||
2 |
=2(x-
-1+
| ||
2 |
-1-
| ||
2 |
=(2x+1-
2 |
2 |
故选D.
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相关题目
方程4x2+4x-1=0的两根为x1=
,x2=
,则把二次三项式4x2+4x-1因式分解,结果应是 ( )
-1+
| ||
2 |
-1-
| ||
2 |
A、(x+
| ||||||||
B、2(2x+1+
| ||||||||
C、(x+1+
| ||||||||
D、(2x+1+
|