I is 64 + k. No more can be said about it without further information about k.
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neg(-k) + neg(-k) = k + k = 2k = 4
Using the discriminant of b^2 -4ac = 0 the value of k works out as -2
It is an algebraic expression
k + 5k = 6k 2 x 3 x k
==> 3k+14=k ==>3k-k=-14 ==>2k=-14 ==>k=-7 ans...