Question

Expand with complete method
${(a + b)}^{2} + {(a - b)}^{2}$
​

Answer 1

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(a + b)² + (a - b)²

⟹ a² + 2ab + b² + a² - 2ab + b²

⟹ 2a² + 2b²

⟹ 2(a² + b²)

____________________________

Answer 2

Answer:

(a+b)²=a²+b².......(1)

(a-b)²=a²-b².........(2)

=a²-a²-b²-b²

=4a-4b

= (a-b)