Question

Pls help me with this question!
Factorize:
1-3x-3y-4(x+y)^2
Thanx!

Answer 1

oh wait youve already used y sorry

Answer 2

\[1-3x-3y-4(x+y)^2\]
taking out -3 common from 2nd and 3rd terms
\[1-3(x+y)-4(x+y)^2\]
let x+y=t\[1-3t-4t^2=-4t^2-3t+1\]
split your middle term and factorize, replace t with x+y