length of tangent **2 = length of whole secant * outer segment of secant ** 2
JK**2 = MK * LK
x**2 = (x + 4) * 2
x**2 = 2x + 8
x**2 - 2x - 8 = 0
(x - 4) (x+ 2) = 0
x = 4 (x = -2 not a solution)
JK is x, so JK = 4 (B)
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