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Which number can be represented as (\sqrt{25}-\sqrt{4}) on the number line?

Answer and explanation

Correct answer: (3)

The direct answer is option A: \(3\). Evaluate each perfect square first: \(\sqrt{25}=5\) and \(\sqrt{4}=2\). Therefore \(\sqrt{25}-\sqrt{4}=5-2=3\). Option A is correct. Option B, 7, would result from adding 5 and 2, not subtracting them. Option C, 21, does not follow from either the square roots or their difference. Option D, \(\sqrt{21}\), incorrectly combines the radicands; in general, \(\sqrt{25}-\sqrt{4}\ne\sqrt{21}\). The number 3 is represented three units to the right of zero on the number line. Memory cue: simplify perfect-square roots before performing the operation.

Related tags

PolynomialsNumber-LineSimplificationPerfect-Square

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