Question
Find the value of (3+√5)(3−√5) .
Answer: Option D
:
D
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:
D
We know the identity:
a2−b2=(a+b)(a−b)
(3+√5)(3−√5)=(32−(√5)2=9−5=4
Hence, (3+√5)(3−√5)=4, which is a rational number.
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