x/7=63/x

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Solution for x/7=63/x equation: 


D( x )

x = 0

x = 0

x = 0

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

x/7 = 63/x // - 63/x

x/7-(63/x) = 0

x/7-63*x^-1 = 0

1/7*x^1-63*x^-1 = 0

(1/7*x^2-63*x^0)/(x^1) = 0 // * x^2

x^1*(1/7*x^2-63*x^0) = 0

x^1

(1/7)*x^2-63 = 0

(1/7)*x^2-63 = 0

DELTA = 0^2-(-63*4*(1/7))

DELTA = 36

DELTA > 0

x = (36^(1/2)+0)/(2*(1/7)) or x = (0-36^(1/2))/(2*(1/7))

x = 21 or x = -21

x in { -21, 21} 

x in { -21, 21 }

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