Question

(a + b)² + (a - b)^2 = 2(a2 + b 2)​

Answer 1

(a+b)^2 + (a-b)^2

= a^2 + 2ab + b^2 + a^2 - 2ab + b^2

=2a^2 + 2b^2

= 2(a^2 + b^2)

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