5x^2-40=0; solve by using square roots.

asked Apr 12, 2018 81.6k views

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5x²-40=0. Add 40 to both sides. 5x²=40. Square both sides of the equation, use add or subtract sign. 5x=+-
√(40)

. Then simplify the radical and divide both sides by 5. The answer is 2
√(2)

or -2

Uj Corb answered Apr 13, 2018

8.2k points

1 vote

5x- SR 40= 0., add to the other side, 5x= SR 40. divide both sides by 5, x= SR of 8, or 2 SR 2

ViFI answered Apr 18, 2018

by ViFI

8.1k points

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