Question: explain equation 0 = -d^2 + 2.2d + 9.03 ] [ d^2 - 2.2d - 9.03 = 0 ( a = 1 ), ( b
explain equation 0 = -d^2 + 2.2d + 9.03 ] [ d^2 - 2.2d - 9.03 = 0 ( a = 1 ), ( b = -2.2 ), and ( c = -9.03 ): [ d = \frac{2.2 \pm \sqrt{4.84 + 36.12}}{2} ] [ d = \frac{2.2 \pm \sqrt{40.96}}{2} ] [ d = \frac{2.2 \pm 6.4}{2} d = \frac{8.6}{2} = 4.3 ] [ d = \frac{-4.2}{2} = -2.1 ]
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