Question

Am nevoie de ajutor cu acest exercitiu

Answer 1

$\displaystyle b_1=2,~b_2=6,~b_5=?\\\\ b_n=b_1\cdot q^{n-1}\\\\ b_2=6 \Rightarrow b_1 \cdot q^{2-1}=6 \Rightarrow 2 \cdot q=6 \Rightarrow q=\frac{6}{2} \Rightarrow q=3\\\\ b_5= 2 \cdot 3^{5-1}\Rightarrow b_5=2 \cdot 3^4 \Rightarrow b_5=2 \cdot 81 \Rightarrow b_5=162$