x2/7=10

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Solution for x2/7=10 equation: 


x in (-oo:+oo)

(x^2)/7 = 10 // - 10

(x^2)/7-10 = 0

1/7*x^2 = 10 // : 1/7

x^2 = 70

x^2 = 70 // ^ 1/2

abs(x) = 70^(1/2)

x = 70^(1/2) or x = -70^(1/2)

x in { 70^(1/2), -70^(1/2) }

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