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What is the value of √32 × √50?

Answer and explanation

Correct answer: 40

The governing concept is the product rule for square roots: √a × √b = √(ab) for non-negative a and b. Applying it gives √32 × √50 = √(32 × 50) = √1600. Since 1600 = 40², its principal square root is 40. A second verification is possible by simplifying each radical: √32 = √(16×2) = 4√2 and √50 = √(25×2) = 5√2. Their product is (4√2)(5√2) = 20×2 = 40. Thus option A is correct. Option B doubles the answer, option C is an incomplete or incorrect simplification because the two √2 factors must also be multiplied, and option D adds radicands instead of multiplying them.

Related tags

Square RootsSurd MultiplicationReal NumbersNumber SystemsMathematicsClass 9 Mcq

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