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Which example shows that \(\sqrt{a+b}=\sqrt a+\sqrt b\) is false?

Answer and explanation

Correct answer: \(\sqrt{4+9}\ne\sqrt4+\sqrt9\)

The governing concept is the use of a counterexample to disprove a statement claimed to hold for all allowed numbers. In option A, the left side is √(4 + 9) = √13, whereas the right side is √4 + √9 = 2 + 3 = 5. Since √13 is not equal to 5, this example directly proves that square roots do not distribute over addition. Options B, C, and D are true only because one of the addends is zero: adding zero leaves the other number unchanged. These special cases do not establish the proposed rule for general positive numbers. Therefore option A is the valid counterexample and the unique correct answer.

Related tags

Real NumbersSquare RootsCounterexampleCommon ErrorsNumber SystemsMathematicsClass 9 Mcq

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