Question

add the following L2+m2, m2+n2, n2+L2, 2lm+2mn+2nL​

Answer 1

Step-by-step explanation:

if

a=l2+m2+n2

b=lm+mn

c=mn+nl

d=nl+lm

then a+b+c+d

=2(l+m+n+lm+nl+mn)

Answer 2

Thus, the sum of the given expressions is 2(l2 + m2 + n2 + lm + mn + nl)