(2x)^2/(0.4-x)(0.4-x)=53.3

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Solution for (2x)^2/(0.4-x)(0.4-x)=53.3 equation: 


D( x )

0.4-x = 0

0.4-x = 0

0.4-x = 0

0.4-x = 0 // - 0.4

-x = -0.4 // * -1

x = 0.4

x in (-oo:0.4) U (0.4:+oo)

(((2*x)^2)/(0.4-x))*(0.4-x) = 53.3 // - 53.3

(((2*x)^2)/(0.4-x))*(0.4-x)-53.3 = 0

4*x^2-53.3 = 0

4*x^2 = 53.3 // : 4

x^2 = 13.325

x^2 = 13.325 // ^ 1/2

abs(x) = 13.325^(1/2)

x = 13.325^(1/2) or x = -13.325^(1/2)

x in { 13.325^(1/2), -13.325^(1/2) }

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