(4x)/15=60/x

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Solution for (4x)/15=60/x equation: 


D( x )

x = 0

x = 0

x = 0

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

(4*x)/15 = 60/x // - 60/x

(4*x)/15-(60/x) = 0

(4*x)/15-60*x^-1 = 0

4/15*x^1-60*x^-1 = 0

(4/15*x^2-60*x^0)/(x^1) = 0 // * x^2

x^1*(4/15*x^2-60*x^0) = 0

x^1

(4/15)*x^2-60 = 0

(4/15)*x^2-60 = 0

DELTA = 0^2-(-60*4*(4/15))

DELTA = 64

DELTA > 0

x = (64^(1/2)+0)/(2*(4/15)) or x = (0-64^(1/2))/(2*(4/15))

x = 15 or x = -15

x in { -15, 15} 

x in { -15, 15 }

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