Question

O 8° termo de uma PA de primeiro termo 6 e razão -4 é:

a)-18
b)-19
c)-20
d)-21
e)-22

Answer 1

$\Large\boxed{\begin{array}{l}\sf a_8=a_1+7r\\\sf a_8=6+7\cdot(-4)\\\sf a_8=6-28\\\sf a_8=-22\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~e}}}}\end{array}}$