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Question

What is the value of (a + b) (a – b)?


A

a2 + b2 – 2ab

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B

a2 + b2 + 2ab

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C

a2 + b2

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D

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 a2b2 this can also be seen by expanding the given expression, (a +b)(a – b) =a2ab+ab+b2 which is nothing but a2b2


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