Đáp án:
Giải thích các bước giải:
4x² - 5x - 6
= (4x² - 8x ) + ( 3x - 6)
= 4x( x - 2) + 3( x - 2)
= ( x -2)( 4x + 3)
5x² + 14x - 3
= ( 5x² + 15x ) - ( x + 3)
= 5x( x + 3) - ( x + 3)
= ( x + 3)( 5x - 1)
5x² - 18x - 8
= ( 5x² - 20x ) + ( 2x - 8)
= 5x( x - 4) + 2( x - 4)
= ( 5x + 2)( x - 4)
6x² + 7x - 3
= ( 6x² + 9x)- ( 2x + 3)
= 3x( 2x + 3) - ( 2x + 3)
= ( 2x + 3)( 3x - 1)
4x² + 8x - 5
= ( 4x² - 2x) + ( 10x - 5)
= 2x( 2x - 1) + 5( 2x - 1)
= ( 2x -1 )( 2x + 5)
