Factorise:
x2−4x−12
x2−4x−12=x2−6x+2x−12 {∵ −12=−6×2−4=−6+2}=x(x−6)+2(x−6)=(x−6)(x+2)
Factorise: x2−4x+3
Factorise: x2−√3x−6