Question

(a + b)² – (a - b)²​

Answer 1

hope you understand my hand writing

Answer 2

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

$\boxed { \pink { x^{2} - y^{2} = (x+y)(x-y) }}$

$= ( a+b+a-b)(a+b-a+b)\\= 2a \times 2b \\= 4ab$

Therefore.,

$\red {(a + b)^{2} - ( a - b )^{2}} \green {= 4ab}$

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