Question

Qual o 6° termo da p.g (5,15)?Com a fórmula.

Answer 1

$\large\boxed{\begin{array}{l}\sf q=\dfrac{15}{5}=3\\\\\sf a_n=a_p\cdot q^{n-p}\\\\\sf a_6=a_2\cdot3^{6-2}\\\sf a_6=15\cdot3^3\\\sf a_6=15\cdot27\\\sf a_6=405\end{array}}$

Answer 2

Resolução!

■ Progressão Geométrica

a1 = 5

n = 6

an = ?

q = a2/a1

q = 15/5

q = 3

an = a1 × q^n - 1

an = 5 × 3^6 - 1

an = 5 × 3^5

an = 5 × 243

an = 1215

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