x的平方减x一12怎样因式分解
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x” - x - 12
= x” + 3x - 4x - 12
= x( x + 3 ) - 4( x + 3 )
= ( x + 3 )( x - 4 )
或者
= x” - 4x + 3x - 12
= x( x - 4 ) + 3( x - 4 )
= ( x + 3 )( x - 4 )
或者配方
= (1/4)[ 4x” - 4x - 48 ]
= (1/4)[ 4x” - 4x + 1 - 49 ]
= (1/4)[ ( 2x - 1 )” - 7” ]
= (1/4)( 2x - 1 + 7 )( 2x - 1 - 7 )
= (1/4)( 2x + 6 )( 2x - 8 )
= ( x + 3 )( x - 4 )
= x” + 3x - 4x - 12
= x( x + 3 ) - 4( x + 3 )
= ( x + 3 )( x - 4 )
或者
= x” - 4x + 3x - 12
= x( x - 4 ) + 3( x - 4 )
= ( x + 3 )( x - 4 )
或者配方
= (1/4)[ 4x” - 4x - 48 ]
= (1/4)[ 4x” - 4x + 1 - 49 ]
= (1/4)[ ( 2x - 1 )” - 7” ]
= (1/4)( 2x - 1 + 7 )( 2x - 1 - 7 )
= (1/4)( 2x + 6 )( 2x - 8 )
= ( x + 3 )( x - 4 )
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