Question

Qual e o 1 termo da PG em que a7=32 e q=2

Answer 1

$a_{1} =?\\ a_{7} =32\\ q=2\\n=7\\\\\\ a_{n} =a_{1} * q^{n-1} \\\\\\ 32 =a_{1} * 2^{7-1}\to\\\\ 32 =a_{1} * 2^{6}\to \\\\32 =a_{1} * 64\to \\\\ \frac{32}{64} =a_{1}\to\\\\ a_{1}= \frac{1}{2}$