(5+√5) (5-√5)
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2
hope it helps you
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Answered by
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this is given in the form of (a+b)(a-b)
we know that (a+b) (a-b)=a²-b²
Therefore,(5+√5)(5-√5)= 5²- √5²
=25-5
= 20
Hence, the answer is 20
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