400=1/25x^2

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Solution for 400=1/25x^2 equation: 


x in (-oo:+oo)

400 = (1/25)*x^2 // - (1/25)*x^2

400-((1/25)*x^2) = 0

(-1/25)*x^2+400 = 0

-1/25*x^2 = -400 // : -1/25

x^2 = 10000

x^2 = 10000 // ^ 1/2

abs(x) = 100

x = 100 or x = -100

x in { 100, -100 }

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