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What is the value of √45 × √80?

Answer and explanation

Correct answer: 60

The answer is A, 60. For non-negative numbers, the product rule for square roots is √a × √b = √(ab). Therefore √45 × √80 = √(45×80) = √3600. Since 3600=60² and the principal square root is non-negative, √3600=60. We can also simplify each radical separately: √45=√(9×5)=3√5 and √80=√(16×5)=4√5. Their product is (3√5)(4√5)=12(√5×√5)=12×5=60. Thus A is correct. B is only half the answer, C does not equal 60, and D has the wrong radicand. A common mistake is to multiply the numbers inside the roots incorrectly or to forget that √5×√5=5.

Related tags

Square RootsReal NumbersSurd MultiplicationPerfect SquaresNumber SystemsMathematicsClass 9 Mcq

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