Question

numa p.a. O 7 termo vale-49 e o 1 termo vale -73 qual a razão da p.a.

Answer 1

an = a1 + ( n -1) . r
-49 = -73 + ( 7 -1) . r
-49 = -73 + 6 r
-49 + 73 = 6 r
24 = 6 r
r = 4


Razão da PA =  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