1/7x^2+1/21x-1=0

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Solution for 1/7x^2+1/21x-1=0 equation: 


x in (-oo:+oo)

(1/7)*x^2+(1/21)*x-1 = 0

1/7*x^2+1/21*x-1 = 0

DELTA = (1/21)^2-(-1*1/7*4)

DELTA = 253/441

DELTA > 0

x = ((253/441)^(1/2)-1/21)/(1/7*2) or x = (-(253/441)^(1/2)-1/21)/(1/7*2)

x = 7/2*((253/441)^(1/2)-1/21) or x = -7/2*((253/441)^(1/2)+1/21)

x in { -7/2*((253/441)^(1/2)+1/21), 7/2*((253/441)^(1/2)-1/21) }

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