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Which is the simplified form of ( (a+b)^2+(a-b)^2 )?

Answer and explanation

Correct answer: (2a^2+2b^2)

The direct answer is option D, \(2a^2+2b^2\). Start with the two standard identities: \((a+b)^2=a^2+2ab+b^2\) and \((a-b)^2=a^2-2ab+b^2\). Add them carefully: \(a^2+2ab+b^2+a^2-2ab+b^2\). The middle terms \(+2ab\) and \(-2ab\) cancel, leaving \(2a^2+2b^2\). Option A, \(4ab\), is not the sum; it is related to the difference of the two squares. Option B, \(2ab\), contains only the middle-term part and misses both square terms. Option C, \(a^2+b^2\), forgets that each square term occurs twice. Option D includes both doubled square terms and is correct. This identity is useful because expansion becomes quick and orderly. Memory cue: adding the plus-square and minus-square makes the middle terms disappear.

Related tags

Sum Of IdentitiesBinomial SquareSimplification

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