Solve for x. 5x to the second power -80=0 A. {16} B. {4} C. {4 , -4} D. {16 , -16}

asked Sep 19, 2018 6.0k views

5 votes

Solve for x.

5x to the second power -80=0

A. {16}
B. {4}
C. {4 , -4}
D. {16 , -16}

by Major

8.7k points

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4 votes

5x^2 - 80 = 0
5x^2 = 80
x^2 = 80/5
x^2 = 16
x = sqrt 16
x = (4,-4) <===

Matteo Hertel answered Sep 24, 2018

8.6k points

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