2/x+1+28/7x+7

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Solution for 2/x+1+28/7x+7 equation: 


D( x )

x = 0

x = 0

x = 0

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

(28/7)*x+2/x+1+7 = 0

4*x^1+2*x^-1+8*x^0 = 0

(4*x^2+8*x^1+2*x^0)/(x^1) = 0 // * x^2

x^1*(4*x^2+8*x^1+2*x^0) = 0

x^1

4*x^2+8*x+2 = 0

4*x^2+8*x+2 = 0

DELTA = 8^2-(2*4*4)

DELTA = 32

DELTA > 0

x = (32^(1/2)-8)/(2*4) or x = (-32^(1/2)-8)/(2*4)

x = (4*2^(1/2)-8)/8 or x = (-4*2^(1/2)-8)/8

x in { (-4*2^(1/2)-8)/8, (4*2^(1/2)-8)/8} 

x in { (-4*2^(1/2)-8)/8, (4*2^(1/2)-8)/8 }

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