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b^2 = 4 ac
(-4)^2 = 4(1)(k)
k = 4
a = 1
b = -4
c = k
b^2 - 4ac = 0
(-4)^2 - 4(1)(k) = 0
16 - 4k = 0
4k = 16
k = 16/4
k = 4