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Which option gives the correct value of 1/(√10 − 3)?

Answer and explanation

Correct answer: √10 + 3

The governing concept is rationalisation of a denominator containing a surd. Multiply the numerator and denominator by the conjugate of √10−3, namely √10+3. Then 1/(√10−3)=(√10+3)/[(√10−3)(√10+3)]. Using (a−b)(a+b)=a²−b², the denominator becomes 10−9=1. Hence the expression simplifies to √10+3. Therefore option A is correct. Option B is the original denominator expression and does not result from rationalisation. Option C incorrectly leaves a factor of 19 in the denominator, while option D expands the expression incorrectly and is not algebraically equivalent. The nonzero denominator is valid because √10 is not equal to 3.

Related tags

RationalisationIrrational-NumbersConjugatesReal-NumbersOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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