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18 April, 22:29

Simplify the expression 2√ 20 - 3√ 7 - 2√ 5 + 4√ 63.

A. 2√ 20 - 3√ 7 + 4√ 63

B. 2√ 5 + 9√ 7

C. 2√ 20 - 3√ 7 - 2√ 5 + 4√ 63

D. 2√ 20 - 4√ 7 - 2√ 5

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Answers (1)
  1. 18 April, 22:52
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    Simplify √20 to 2√5

    2 * 2√5 - 3√7 - 2√5 + 4√63

    Simplify √63 to 3√7

    2 * 2√5 - 3√7 - 2√5 + 4 * 3√7

    Simplify 2 * 2√5 to 4√5

    4√5 - 3√7 - 2√5 + 4 * 3√7

    Simplify 4 * 3 √7 to 12√7

    Collect like terms

    (4√5 - 2√5) + (-3√7 + 12√7)

    Simplify

    2√5 + 9√7

    Answer: B
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