It is impossible to answer the question without some information about V or t or what the equation is meant to represent.
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X2 = k Take square root each side. X = (+/-) sqrt(k) ============
31 = 3-4k 31-3 = -4k 28 = -4k Divide both sides of the equation by -4 to find the value of k: k = -7
Using the discriminant the possible values of k are -9 or 9
Using the discriminant of b^2 -4ac = 0 the value of k works out as -2
K = 6