Question

Factor the following expression (l+m)2-(l-m) 2​

Answer 1

Answer:

${a}^{2}-{b}^{2} = (a+b)(a-b)$

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