Solve for D
D=-w\left(w-4\right)
Solve for w
w=\sqrt{4-D}+2
w=-\sqrt{4-D}+2\text{, }D\leq 4
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D=-4\left(-w\right)+\left(-w\right)w
Use the distributive property to multiply -w by -4+w.
D=4w+\left(-w\right)w
Multiply -4 and -1 to get 4.
D=4w-w^{2}
Multiply w and w to get w^{2}.
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