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6x^2-7x+5 分解因式
2个回答
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6x" - 7x + 5
= ( 1/24 )( 144x" - 168x + 120 )
= ( 1/24 )[ ( 12x )" - 14( 12x ) + 7" - 49 + 120 ]
= ( 1/24 )[ ( 12x - 7 )" + 71 ]
这样要分解因式,就只能在复数范围
= ( 1/24 )[ ( 12x - 7 )" - ( - 71 ) ]
= ( 1/24 )[ 12x - 7 - (√71)i ][ 12x - 7 + (√71)i ]
6x" - 7x - 5
= 6x" + 3x - 10x - 5
= 3x( 2x + 1 ) - 5( 2x + 1 )
= ( 2x + 1 )( 3x - 5 )
= ( 1/24 )( 144x" - 168x + 120 )
= ( 1/24 )[ ( 12x )" - 14( 12x ) + 7" - 49 + 120 ]
= ( 1/24 )[ ( 12x - 7 )" + 71 ]
这样要分解因式,就只能在复数范围
= ( 1/24 )[ ( 12x - 7 )" - ( - 71 ) ]
= ( 1/24 )[ 12x - 7 - (√71)i ][ 12x - 7 + (√71)i ]
6x" - 7x - 5
= 6x" + 3x - 10x - 5
= 3x( 2x + 1 ) - 5( 2x + 1 )
= ( 2x + 1 )( 3x - 5 )
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