The answer is 8.5, which is one solution and real.
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8 = 8v - 4v8 This equation does not have any real solution.
It has one double solution.
You should be able to look at this equation, or use the discriminant and know that there are no real roots.
w2-3w = 0 w(w-3) = 0 w = 3 or w = 0
If you have -2x = 0, to solve for x, divide each side by two. That results in x = -0/2, or x = 0. So there is only one solution.