7x - 6x^2 - 2
= - ( 6x^2 - 7x + 2 )
= - ( 6x^2 - 3x - 4x + 2)
= - [ 3x( 2x - 1) - 2(2x - 1)]
= - ( 2x - 1)( 3x - 2)
2 /
2x^2 + 3x - 5
= 2x^2 + 5x - 2x - 5
= x ( 2x+5) - ( 2x+ 5)
=( x - 1)( 1x+ 5)
3/ 16x - 5x^2 - 3
= - ( 5x^2 - 16x + 3)
= - (5x^2 - x - 15x + 3)
= - [ x( 5x - 1) - 3 ( 5x - 1)]
= - [ (x - 3)( 5x - 1)]
= - ( x- 3)( 5x - 1)