Question

l2 + m2 + n2 , lm+mn , mn + nl , nl + lm. Add the Following Expressions. Please Answer me Fast. Who Will Give me the Answer With Explanation, I Will Mark Him As Branliest Answer​

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)

hope u understand it

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Answer 2

Answer:

12 +m2+n2+1m+mn+mn+nl+nl+1m

now rearrange it

12+m2+n2+1m+1m+mn+mn+nl+nl

now add it

12+m2+n2+2m+2mn+2nl