49=2x^2/0.4

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Solution for 49=2x^2/0.4 equation: 


x in (-oo:+oo)

49 = (2*x^2)/0.4 // - (2*x^2)/0.4

49-((2*x^2)/0.4) = 0

49-5*x^2 = 0

-5*x^2 = -49 // : -5

x^2 = 49/5

x^2 = 49/5 // ^ 1/2

abs(x) = (49/5)^(1/2)

x = (49/5)^(1/2) or x = -(49/5)^(1/2)

x in { (49/5)^(1/2), -(49/5)^(1/2) }

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