Question

em uma p.a, o 7° termo vale -49 e o primo vale -73. qual é a razao dessa p.a???

Answer 1

$\boxed{a_n=a_1+(n-1)*r}\\\\ a_7=-49\\ a_1=-73\\ n=7\\\\ -49=-73+(7-1)*r\\\\ -49=-73+6r\\\\ 6r=-29+73\\\\ 6r=24\\\\ \boxed{r=4}$

Answer 2

Bom Dia!

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Dados:

a1 → -73

n→ 7

r → ?

an → -49

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An=a1+(n-1)·r

-49=-73+(7-1)·r

-49=-73+6r

-49+73=6r

6r=24

r=24/6

r=4

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Att;Guilherme Lima