Question

calcule o 7 termo da uma P.G (3,-6,12)

Answer 1

A1= 3 An=3.(-2)⁷⁻¹
Q= -2 An=3.(-2)⁶
N= 7 An=3.64
An=192

Answer 2

$\mathtt{q = A_2 \div A_1} \\ \mathtt{q = -6\div3} \\ \mathtt{q = -2}$

$\mathtt{A_n = A_1~.~q^{n-1}} \\ \\ \mathtt{A_7=3~.~(-2)^{7-1}} \\ \\ \mathtt{A_7=3~.~(-2)^6} \\ \\ \mathtt{A_7=3~.~64} \\ \\ \mathtt{A_7 =192 } \\ \\ \\ \boxed{\boxed{\mathtt{Resposta: A_7 = 192}}}$