Question

solve
$d {}^{2} = \frac{d + 15}{6}$
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Answer 1

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${d}^{2} = \frac{(d + 15)}{6} \\ {d}^{2} \times 6 = d + 15 \\ 6 {d }^{2} - d - 15 = 0 \\ {6d}^{2} + 9d - 10d - 15 = 0 \\ \\ 3d(2d + 3) - 5(2d + 3) \\ \\ (3d - 5)(2d + 3)$