________________________________________
Dados:
a1→ -8
n → 2+6 = 8
r → ?
an → 13
Em busca da razão da P.A :
An=a1+(n-1)·r
13=-8+(8-1)·r
13=-8+7r
13+8=7r
21=7r
r=21/7
r=3
P.A (-8, -5, -2, 1, 4, 7, 10, 13)
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Verified answer
A₁ = -8a₈ = 13
r = ?
a₈ = a₁ + 7r
13 = -8 + 7r
7r = 13 + 8
7r = 21
r = 21/7
r = 3
P.A. (-8, -5, -2, 1, 4, 7, 10, 13)
Boa tarde!
________________________________________
Dados:
a1→ -8
n → 2+6 = 8
r → ?
an → 13
________________________________________
Em busca da razão da P.A :
An=a1+(n-1)·r
13=-8+(8-1)·r
13=-8+7r
13+8=7r
21=7r
r=21/7
r=3
________________________________________
P.A (-8, -5, -2, 1, 4, 7, 10, 13)
________________________________________
Att;Guilherme Lima