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Black_prince [1.1K]
3 years ago
5

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

Mathematics
2 answers:
Pavel [41]3 years ago
5 0
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
Blizzard [7]3 years ago
3 0
5x²-40=0. Add 40 to both sides. 5x²=40. Square both sides of the equation, use add or subtract sign. 5x=+-\sqrt{40}. Then simplify the radical and divide both sides by 5. The answer is 2\sqrt{2} or -2\sqrt{2}
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