Which of the following is not an identity?

- = (x + a)(x- a)

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(x + a)(x + b) = + x(a + b) + ab

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- = 4ab

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All of these

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Solution

The correct option is D
All of these

${(a + b)}^{2} + {(a - b)}^{2} i s n o t e q u a l t o 4 a b$ . So, it is not an identity.

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