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When the reciprocal of a positive number is subtracted from the number, the result is \(\frac{3}{2}\). What is the number?

Answer and explanation

Correct answer: \(2\)

Let the number be \(x\). Then \(x-\frac{1}{x}=\frac{3}{2}\). Multiplying by \(2x\) gives \(2x^2-3x-2=0\), which factors as \((2x+1)(x-2)=0\). Thus, \(x=-\frac{1}{2}\) or \(x=2\). Since the number is positive, \(x=2\) is the valid answer. Check: \(2-\frac{1}{2}=\frac{3}{2}\). Exam tip: After clearing the reciprocal, always apply the condition given in the question, such as positivity.

Related tags

Quadratic EquationsReciprocal NumbersWord ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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