Question

(l + m)² – (l – m)²?​

Answer 1

Answer:

$2 {m}^{2}$

Step-by-step explanation:

${l}^{2} + {m}^{2} + 2 \times l \times \: m - {l}^{2} + {m}^{2} - 2 \times l \times m$

=

$2 {m}^{2}$

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Answer 2

Step-by-step explanation:

(a+b)²=a²+b²+2ab

(a-b)²=a²+b²-2ab

so .. l²+m²+2lm -l²-m²+2lm

=> 4lm