(1.6/(x^3))-(4.2/(x^4))

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Solution for (1.6/(x^3))-(4.2/(x^4)) equation: 


D( x )

x^4 = 0

x^3 = 0

x^4 = 0

x^4 = 0

1*x^4 = 0 // : 1

x^4 = 0

x = 0

x^3 = 0

x^3 = 0

1*x^3 = 0 // : 1

x^3 = 0

x = 0

x in (-oo:0) U (0:+oo)

1.6/(x^3)-(4.2/(x^4)) = 0

1.6/(x^3)-4.2*x^-4 = 0

1.6*x^-3-4.2*x^-4 = 0

x^-3*(1.6-4.2*x^-1) = 0

-4.2*x^-1 = -1.6 // : -4.2

x^-1 = 0.38095238

-1 < 0

1/(x^1) = 0.38095238 // * x^1

1 = 0.38095238*x^1 // : 0.38095238

2.62500001 = x^1

x = 2.62500001

1/(x^3) = 0

1*x^-3 = 0 // : 1

x^-3 = 0

x naleu017Cy do O

x = 2.62500001

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