Question

Do this question if you are interested
$- 2x ^{2} + x + 21$
:)​

Answer 1

$-2x² + x + 21$

Common factor

$-2x² + x + 21$

$-1(2x²-x-21)$

Use the sum-product pattern

$-1(2x²-x-21)$

$-1(2x² +6x-7x - 21)$

Common factor from the two pairs

$-1(2x² + 6x - 7x - 21)$

$-1(2x(x + 3) - 7(x+3))$

Rewrite in factored form

$-1(2x(x + 3) - 7(x+3))$

$-1(2x-7)(x+3)$

Answer :-${\large{ \red{{{-1(2x-7)(x+3)}}}}}$