Question

please solve it asap

Answer 1

(a+b)² + (a-b)²
= (a+b+a-b)² - 2(a+b)(a-b)
= (2a)² - 2(a²-b²)
= 4a² - 2a² + 2b²
= 2a² + 2b²

Answer 2

( a+b) ^2 + (a-b)^2 

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

= 2 ( a ^ 2 + b ^ 2) 

= 2 a ^ 2 + 2 b ^ 2

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