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What is the value of −√4?

Answer and explanation

Correct answer: −2

The governing concept is the principal square root and the effect of an outside negative sign. The symbol √4 denotes the non-negative principal square root of 4, so √4 = 2. The minus sign is written before the radical and therefore changes the result after the square root is evaluated: −√4 = −(2) = −2. Thus option B is correct. Option A would be correct for √4 without the outside negative sign. Option C is the radicand, not its square root, while option D incorrectly treats the square root of 4 as 4 and also applies a negative sign. It is important not to confuse −√4 with √(−4), which is not a real number.

Related tags

Real NumbersPrincipal Square RootNegative SignNumber SystemsMathematicsClass 9 Mcq

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