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23 September, 04:27

Simplify this radical.

V84

2/21

242

4/21

4/42

+4
Answers (2)
  1. 23 September, 05:17
    0
    2√21

    Step-by-step explanation:

    √81 is √4 times √21

    Since √4 is a perfect square, √4 = 2

    We are left with 2 times √21

    2√21
  2. 23 September, 06:07
    0
    2√21

    Step-by-step explanation:

    √84

    84 can be written as 4 * 21.

    √ (4 * 21)

    Distribute the square root to both terms.

    √4 * √21

    4 is a perfect square.

    2 * √21
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