What is the value of (a + b) (a – b)?

a² + b² – 2ab

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a² + b² + 2ab

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a² + b²

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a² – b²

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Solution

The correct option is D
a² – b²

We know from the algebraic identities that (a + b)(a – b) would give $a^{2} - b^{2}$ this can also be seen by expanding the given expression, (a +b)(a – b) = $a^{2} - a b + a b + b^{2}$ which is nothing but $a^{2} - b^{2}$

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