x/12=27/x

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Solution for x/12=27/x equation: 


D( x )

x = 0

x = 0

x = 0

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

x/12 = 27/x // - 27/x

x/12-(27/x) = 0

x/12-27*x^-1 = 0

1/12*x^1-27*x^-1 = 0

(1/12*x^2-27*x^0)/(x^1) = 0 // * x^2

x^1*(1/12*x^2-27*x^0) = 0

x^1

(1/12)*x^2-27 = 0

(1/12)*x^2-27 = 0

DELTA = 0^2-(-27*4*(1/12))

DELTA = 9

DELTA > 0

x = (9^(1/2)+0)/(2*(1/12)) or x = (0-9^(1/2))/(2*(1/12))

x = 18 or x = -18

x in { -18, 18} 

x in { -18, 18 }

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