Question

em uma pa determine a 40 sabendo que a1 = -5 e R = - 3​

Answer 1

Resposta:

-122

Explicação passo-a-passo:

a1=-5

r=-3

n=40

an=?

Formula:an=a1+(n-1).r

an=-5+(40-1).-3

an=-5+39.-3

an=-5+(-117)

an=-122

Conferindo:(-5,-8,-11,-14,-17,-20,-23,-26,-29,-32,-35,-38,-41,-44,-47,-50,-53,-56,-59,-62,-65,-68,-71,-74,-77,-80,-83,-86,-89,-92,-95,-98,-101,-104,-107,-110,-113,-116,-119,-122)