x^2+21x+49/7x^2

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Solution for x^2+21x+49/7x^2 equation: 


x in (-oo:+oo)

x^2+(49/7)*x^2+21*x = 0

8*x^2+21*x = 0

DELTA = 21^2-(0*4*8)

DELTA = 441

DELTA > 0

x = (441^(1/2)-21)/(2*8) or x = (-441^(1/2)-21)/(2*8)

x = 0 or x = -21/8

x in { -21/8, 0 }

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