alleryStart learning →Add the squares of the sum and difference: (a+b)²+(a−b)².
A2a² + 2b²
Ba² + b²
Ca² − b²
D2a² − 2b²
Answer & Solution
Correct answer: A. 2a² + 2b²
The cross-terms +2ab and −2ab cancel on addition, leaving twice each square.
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