Question

-2х2 - 18x - 40 factorise​

Answer 1

- 2(x + 5) (x + 4)

Step-by-step explanation:

$- 2x {}^{2} - 18x - 40$

$- 2(x {}^{2} + 9x + 20)$

$- 2( {x}^{2} + 5x + 4x + 20)$

$- 2{x(x + 5) + 4(x + 5)}$

$- 2(x + 5)( x + 4)$