Question

simplify;-
1. l(l+m+n)-m(l-m+n)+n(-l+m+n)​

Answer 1

l(l+m+n)-m(l-m+n)+n(-l+m+n)

= l² + ml + nl -ml + m² - mn - nl +mn + n²

= l² + m² + n² + ml - ml - nl + nl - mn + mn

= l² + m² + n²

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