Question

Add the following:
l²- m², m²+n²+p², m²+l², l²-m²+n²-p²

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Answer 1

Answer:

l2 - m2 + m2 +n2 +p2 + m2 + l2 + l2 - m2 + n2 - p2

3l2 + 2n2.

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