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When 512 is subtracted from the square of a number, the result is 1809. What is the positive value of the number?

Answer and explanation

Correct answer: \(\sqrt{2321}\)

Let the number be \(x\). Then \(x^2-512=1809\), so \(x^2=2321\). Therefore, the positive value is \(x=\sqrt{2321}\), approximately 48.18. Although 48 is close, \(48^2-512=1792\), not 1809. Exam tip: Form the equation first, isolate the square, and then take the positive square root when the question asks for the positive value.

Related tags

Quadratic EquationsWord ProblemsSquare RootsLinear Equations In One VariableConsistency CheckWord Problems And ApplicationsMathematicsClass 10 Mcq

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