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4 September, 08:18

Solve for x.

5x2 - 80 = 0

A.

{16, - 16}

B.

{16}

C.

{4}

D.

{4, - 4}

+4
Answers (2)
  1. 4 September, 08:40
    0
    x = {-4, 4}

    Divide each side by '5'. x2 = 16 Simplifying x2 = 16 Take the square root of each side: x = {-4, 4}
  2. 4 September, 08:42
    0
    Answer is D. 5x2 - 80 = 0 5x2 = 0+80 5x2 = 80 x2 = 80/5 x2 = 16 By taking sqr root of both sides, we get x = 4 and x = - 4 So, the answer is {4, - 4}
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