27-10-2017
Mathematics

contestada

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

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jallen2409 jallen2409

27-10-2017

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

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piano12star piano12star

27-10-2017

5x²-40=0. Add 40 to both sides. 5x²=40. Square both sides of the equation, use add or subtract sign. 5x=+-[tex] \sqrt{40} [/tex]. Then simplify the radical and divide both sides by 5. The answer is 2[tex] \sqrt{2} [/tex] or -2[tex] \sqrt{2} [/tex]

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