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What is the value of √2 × √18?

Answer and explanation

Correct answer: 6

The governing concept is the product property of square roots for non-negative numbers: √a × √b = √(ab). Applying it gives √2 × √18 = √(2 × 18) = √36. The principal square root of 36 is 6 because 6² = 36 and the principal root is non-negative. Therefore option A is correct. Option B, √20, results from an incorrect operation and is not equal to the product. Option C simply rewrites part of the expression without using the correct product property, while option D is incorrect because 9² = 81, not 36. This example also illustrates that multiplying two irrational square roots can produce a rational integer.

Related tags

Real NumbersSquare RootsSurd MultiplicationRadical SimplificationNumber SystemsMathematicsClass 9 Mcq

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