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What is the value of (√9 + √4)?

Answer and explanation

Correct answer: 5

The governing concept is evaluation of principal square roots. The principal square root of a positive number is its non-negative root. Since 3 × 3 = 9, √9 = 3, and since 2 × 2 = 4, √4 = 2. Therefore, √9 + √4 = 3 + 2 = 5, so option A is correct. Option B, √13, comes from the incorrect assumption that √a + √b equals √(a + b); square roots generally cannot be combined across addition. Option C does not follow from the two evaluated roots, and option D is also inconsistent with the calculation. The exact value is obtained by evaluating each square root separately and then adding the results.

Related tags

Real NumbersSquare RootsRadicalsPrincipal RootNumber SystemsMathematicsClass 9 Mcq

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