(3a²+2a-8)²-(a²-2a-8)² 因式分解 数学题要有过程. 快~

(3a²+2a-8)²-(a²-2a-8)² 因式分解 数学题要有过程. 快~
(3a²+2a-8)²-(a²-2a-8)² 因式分解 数学题
要有过程. 快~

(3a²+2a-8)²-(a²-2a-8)² 因式分解 数学题要有过程. 快~
( 3a" + 2a - 8 )" - ( a" - 2a - 8 )"
= [ ( 3a" + 2a - 8 ) + ( a" - 2a - 8 ) ][ ( 3a" + 2a - 8 ) - ( a" - 2a - 8 ) ]
= ( 3a" + 2a - 8 + a" - 2a - 8 )( 3a" + 2a - 8 - a" + 2a + 8 )
= ( 4a" - 16 )( 2a" + 4a )
= [ 4( a" - 4 ) ][ 2( a" + 2a ) ]
= 8( a" - 2" )[ a( a + 2 ) ]
= 8a( a + 2 )( a - 2 )( a + 2 )
= 8a( a - 2 )( a + 2 )"