Question

Calcule o oitavo termo da progressão aritmética (-6,-2,2...)

Answer 1

$> \: resolucao \\ \\ \geqslant \: progressao \: \: aritmetica \\ \\ r = a2 - a1 \\ r = - 2 - ( - 6) \\ r = - 2 + 6 \\ r = 4 \\ \\ = = = = = = = = = = = = = = = = \\ \\ > \: o \: oitavo \: termo \: da \: pa \\ \\ an = a1 + (n - 1)r \\ an = - 6 + (8 - 1)4 \\ an = - 6 + 7 \times 4 \\ an = - 6 + 28 \\ an = 22 \\ \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant$

Answer 2

$a_n=a_1+(n-1)\cdot r$

$a_8=-6+(8-1)\cdot4$

$a_8=-6+7\cdot4$

$a_8=-6+28$

$\boxed{\boxed{a_8=22 }}$