factorise this question plz fast
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we have used the identity 1 and 2 and the answer is 4lm
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Step-by-step explanation:
(L+M)² - (L-M)² = [L² + 2LM + M²] - [L² - 2LM + M²]
Identity used:
(a+b)² = a²+2ab+b² ; ; (a-b)² = a²-2ab+b²
= L² + 2LM + M² - L² + 2LM - M²
= 4LM
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