Question

7x^2-25x-12.
2x^2-x-21.FACTORISE BY SPLITTING MIDDLE TERM

Answer 1

$7 {x}^{2} - 25x - 12 \\ 7 {x}^{2} - 28x + 3x - 12 \\ 7x(x - 4) - 3(x - 4) \\ (7x - 3)(x - 4)$
$2 {x}^{2} - x - 21 \\ 2 {x}^{2} - 7x + 6x - 21 \\ x(2x - 7) + 3(2x - 7) \\ (2x - 7)(x + 3)$