Question

factorise 12-x-x²
Purse tell fast​

Answer 1

Step-by-step explanation:

$- x {}^{2} - x + 12 \\ = - x ^{2} - 4x + 3x + 12 \\ = - x(x + 4) + 3(x + 4) \\ = ( - x + 3)(x + 4) \\ x = 3 \: \: or \: x = - 4$