Question

Factarize :- (l+m)² - (l-m)²​

Answer 1

Answer:

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${(l + m)}^{2} - {(l - m)}^{2} \\ \\ = (l + m + l - m) \times (l + m - l + m) \\ \\ = (2l) \times (2m) \\ \\ = 4 \: l \: m$