Question

if (x+l) (x+m) =x^2 +4x +2 find l^2+m^2 , (l-m)^2

Answer 1

(x+l)(x+m)=x^2+4x+2
x^2+x(m+l)+lm=x^2+4x+2
on comparing
m+l=4
lm= 2
now solve both equation you will get desire answer