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18 March, 18:27

Solve for x.

5x to the second power - 80=0

A. {16}

B. {4}

C. {4, - 4}

D. {16, - 16}

+4
Answers (2)
  1. 18 March, 19:57
    0
    5x^2 - 80 = 0

    5x^2 = 80

    x^2 = 80/5

    x^2 = 16

    x = sqrt 16

    x = (4,-4) <===
  2. 18 March, 21:40
    0
    I believe the Correct answer would be D. {16, - 16}
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