Question

3. Add the following expressions:
(iii) l^2 + m^2 + n^2 + Im + mn + mn + nl + nl+ Im

Answer 1

$\huge{\underline{\tt{QUESTION:-}}}$

Add the following expressions:

l^2 + m^2 + n^2 + Im + mn + mn + nl + nl+ Im

$\huge{\underline{\tt{ANSWER:-}}}$

l^2 + m^2 + n^2 + Im + mn + mn + nl + nl+ Im

$\implies$ l^2 + m^2 + n^2 + lm + lm + nl + nl + mn + mn

$\implies$ l^2 + m^2 + n^2 + 2lm + 2nl + 2mn

Answer 2

Answer:

${(x + y + z)}^{2} = {x}^{2} + {y}^{2} + {z}^{2} +2xy + 2yz + 2zx$

${l}^{2} + {m}^{2} + {n}^{2} + lm + mn + mn + nl + nl + lm$

${l}^{2} + {m}^{2} + {n}^{2} + 2lm + 2mn + 2nl$

${(l + m + n)}^{2}$

$(l + m + n)(l + m + n)$

Explanation:

Hope it helps you out.....