4800/x^4=21

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Solution for 4800/x^4=21 equation: 


D( x )

x^4 = 0

x^4 = 0

x^4 = 0

1*x^4 = 0 // : 1

x^4 = 0

x = 0

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

4800/(x^4) = 21 // - 21

4800/(x^4)-21 = 0

4800*x^-4 = 21 // : 4800

x^-4 = 7/1600

-4 < 0

1/(x^4) = 7/1600 // * x^4

1 = 7/1600*x^4 // : 7/1600

1600/7 = x^4

x^4 = 1600/7 // ^ 1/4

abs(x) = (1600/7)^(1/4)

x = (1600/7)^(1/4) or x = -(1600/7)^(1/4)

x in { (1600/7)^(1/4), -(1600/7)^(1/4) }

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