3/7x2=x+1

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Solution for 3/7x2=x+1 equation: 


x in (-oo:+oo)

(3/7)*x^2 = x+1 // - x+1

(3/7)*x^2-x-1 = 0

3/7*x^2-x-1 = 0

DELTA = (-1)^2-(-1*3/7*4)

DELTA = 19/7

DELTA > 0

x = ((19/7)^(1/2)+1)/(3/7*2) or x = (1-(19/7)^(1/2))/(3/7*2)

x = 7/6*((19/7)^(1/2)+1) or x = 7/6*(1-(19/7)^(1/2))

x in { 7/6*(1-(19/7)^(1/2)), 7/6*((19/7)^(1/2)+1) }

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