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\[ x(x+2) = 288 \]
\[ x^2 + 2x - 288 = 0 \]
\[ x = rac{-2 \pm \sqrt{4 + 1152}}{2} = rac{-2 \pm \sqrt{1156}}{2} \]
\[ x = rac{-2 \pm 34}{2} \]
#### 16, 18
\[ S_n = a rac{r^n - 1}{r - 1} \]
\[ S_6 = 3 rac{2^6 - 1}{2 - 1} = 3(64 - 1) = 3 imes 63 = 189 \]
#### 189
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