Question

Descompuneti in factori n^2-n-12

Answer 1

$n^{2} -n-12= n^{2} -9-n-3=(n+3)(n-3)-(n+3)= \\ =(n+3)(n-3-1)=\boxed{(n+3)(n-4)}.$

Answer 2

n²-n-12=n²+3n-4n-12=n(n+3)-4(n+3)=(n+3)(n-4)