7/2k^2-k-4/7=0

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Solution for 7/2k^2-k-4/7=0 equation: 


k in (-oo:+oo)

(7/2)*k^2-k-(4/7) = 0

(7/2)*k^2-k-4/7 = 0

7/2*k^2-k-4/7 = 0

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

DELTA = 9

DELTA > 0

k = (9^(1/2)+1)/(2*7/2) or k = (1-9^(1/2))/(2*7/2)

k = 4/7 or k = -2/7

k in { -2/7, 4/7 }

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