Question

a + b whole square minus a minus b whole square​

Answer 1

Answer:

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

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Answer 2

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▪︎ (x+y)² = x²+y²+2xy.--(1)

▪︎ (x-y)² = x²+y²-2xy. --(2)

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=》 (a+b)²-(a-b)².

= (a²+b²+2ab)-(a²+b²-2ab).

{From IDs (1) and (2)}

= a²+b²+2ab-a²-b²+2ab

{By opening brackets}

${\large{\red{\boxed{\bold{=\:4ab.}}}}}$

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