What is the conjugate of surd (3under root 7 - 2 under root 5?
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The conjugate of surd of
(3√7 - 2√5) is
(3√7 + 2√5 )
Product of conjugate surds
is a rational number.
(3√7-2√5)(3√7 + 2√5 )
=(3√7)²-(2√5)²
= 63-20
= 43
= ( Rational number )
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