0
x2 + 6x = 16
x2 + 6x - 16 = 0
(x + 8)(x - 2) = 0
x + 8 = 0 or x - 2 = 0
x = -8 or x = 2
Since it is given that x > 0, then x = -8 is not a solution of the equation. Thus, the only solution is x = 2.
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