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When 11 is subtracted from the square of a number, the result is 85. What is the positive number?

Answer and explanation

Correct answer: 4√6

Let the unknown number be x. The statement translates directly to x² − 11 = 85. Adding 11 to both sides gives x² = 96. Since 96 = 16 × 6, its square root is √96 = 4√6. The question asks for the positive number, so the positive root is selected; mathematically the equation also has the negative root −4√6, but it is not an allowed answer here. Option B simplifies to 12, whose square is 144 and does not satisfy the equation. Option C gives 81 − 11 = 70, and option D gives 144 − 11 = 133. Therefore option A is the only value that satisfies the original condition.

Related tags

Quadratic-EquationsWord-ProblemsSquare-RootsWord Problems And ApplicationsQuadratic EquationsMathematicsClass 10 Mcq

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