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If P is at √256 - √121 on the number line, what is the coordinate of P?

Answer and explanation

Correct answer: 5

The governing concept is evaluating exact square roots and then performing the indicated subtraction. Since 256 = 16², √256 = 16. Since 121 = 11², √121 = 11. Therefore the coordinate of P is √256 − √121 = 16 − 11 = 5, so option A is correct. No decimal approximation is needed because both radicands are perfect squares. Option B comes from adding the two roots instead of subtracting them. Option C has no valid basis in the calculation, while option D is only √256 and ignores the second term. The coordinate is therefore an exact real number, and its positive value places P five units to the right of zero on the number line.

Related tags

Number LinePerfect SquaresExact Square RootsClass 10 MathematicsRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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