6x^2+18x^3/7x+21x^2

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Solution for 6x^2+18x^3/7x+21x^2 equation: 


x in (-oo:+oo)

x*((18*x^3)/7)+6*x^2+21*x^2 = 0

18/7*x^4+27*x^2 = 0

t_1 = x^2

18/7*t_1^2+27*t_1^1 = 0

18/7*t_1^2+27*t_1 = 0

DELTA = 27^2-(0*18/7*4)

DELTA = 729

DELTA > 0

t_1 = (729^(1/2)-27)/(2*18/7) or t_1 = (-729^(1/2)-27)/(2*18/7)

t_1 = 0 or t_1 = -21/2

t_1 = -21/2

x^2+21/2 = 0

1*x^2 = -21/2 // : 1

x^2 = -21/2

t_1 = 0

x^2+0 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x = 0

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