simplify (6l-4m-7n)²
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Step-by-step explanation:
Simplify using the formula:
(a+b+c)² = a² + b² + c² + 2ab + 2bc + 2ac
,', (6l + (-4m) + (-7m) )² = (6l)² + (-4m)² + (-7n)² + 2 (6l) (-4m) + 2 (-4m) (-7n) + 2 (6l) (-7n)
= 36l² + 16m² + 49n² - 48lm + 56mn - 84ln
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