Given that,
-12x² - 50x - 50
=> 2 (-6x^2 - 25x - 25)
=> -2 (6x^2 + 25x + 25)
=> -2 (6x^2 + 15x + 10x + 25 )
=> -2 [ 3x (2x + 5) + 5 (2x + 5)]
=> -2 [(2x + 5) (3x + 5)]
