Simplify square root of 3 times square root of 21 . (1 point) Group of answer choices square root of 24 square root of 63 3 square root of 7 None of the above

  3√7

Step-by-step explanation:

(√3)(√21) = √(3·21) = √(3·3·7) = √(3²·7) = 3√7

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The product of the roots is the root of the product. The product, 3·21 = 63, has a square factor that can be removed from under the radical. You need to factor out the root of that square when you simplify the expression.

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step-by-step explanation:

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step-by-step explanation:

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