Question
Find the value of (√2+√2)(√2−√2).
Answer: Option A
:
A
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:
A
A common tendency to solve this question is to apply the algebraic identity (a2−b2)=(a+b)(a−b). But by observation, we can see that (√2−√2), which is one of the factors, will result in 0, thus making the final value of the whole expression as 0 i.e.
(√2+√2)(√2−√2)
=(√2+√2)×(0)
=0
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