Resposta :
[tex]a_{n} = a_{1} * q^{n - 1}[/tex]
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[tex]a_{n} = a_{1} * q^{n - 1}[/tex]
[tex]a_{4} = a_{1} * q^{4 - 1}[/tex]
[tex]a_{4} = a_{1} * q^{3}[/tex]
[tex]12 = a_{1} * 2^{3}[/tex]
[tex]12 = a_{1} * 8[/tex]
[tex] \frac{12}{8} = a_{1} [/tex]
[tex] a_{1} = \frac{3}{2} [/tex]
[tex]a_{8} = a_{1} * q^{8 - 1}[/tex]
[tex]a_{8} = a_{1} * q^{7}[/tex]
[tex] a_{8} = \frac{3}{2} * 2^{7}[/tex]
[tex]a_{8} = 3 * 2^{7 - 1}[/tex]
[tex]a_{8} = 3 * 2^{6}[/tex]
[tex]a_{8} = 3 * 64[/tex]
[tex]a_{8} = 192[/tex]
_________________
[tex]a_{n} = a_{1} * q^{n - 1}[/tex]
[tex]a_{4} = a_{1} * q^{4 - 1}[/tex]
[tex]a_{4} = a_{1} * q^{3}[/tex]
[tex]12 = a_{1} * 2^{3}[/tex]
[tex]12 = a_{1} * 8[/tex]
[tex] \frac{12}{8} = a_{1} [/tex]
[tex] a_{1} = \frac{3}{2} [/tex]
[tex]a_{8} = a_{1} * q^{8 - 1}[/tex]
[tex]a_{8} = a_{1} * q^{7}[/tex]
[tex] a_{8} = \frac{3}{2} * 2^{7}[/tex]
[tex]a_{8} = 3 * 2^{7 - 1}[/tex]
[tex]a_{8} = 3 * 2^{6}[/tex]
[tex]a_{8} = 3 * 64[/tex]
[tex]a_{8} = 192[/tex]