tolong kak bantuannya
[tex]u5 = 324 \\ a {r}^{n - 1} = 324 \\ 4 {r}^{5 - 1} = 324 \\ 4 {r}^{4} = 324 \\ {r}^{4} = \frac{324}{4} = 81 \\ r = \sqrt[4]{81} = 3 \\ \\ sn = \frac{a( {r}^{n} - 1)}{r - 1} \\ \\ s5 = \frac{4( {3}^{5} - 1) }{3 - 1} \\ \\ s5 = \frac{4(243 - 1)}{2} \\ \\ s5 = 2(242) \\ s5 = 484 \: cm \: (b) [/tex]
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