Which of the following is an identity?

(t + 3) (t - 3) = t^{2} - 9

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(t + 3) (t - 3) = t^{2} + 9

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(t + 3) (t - 3) = t^{2} - 9 + 3 t

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none of these

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Solution

The correct option is A $(t + 3) (t - 3) = t^{2} - 9$
$(a + b) (a + b) = a^{2} - b^{2}$

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