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Which sequence matches the recursive formula?

an = 2an-1 + 5, where a1 = 5

A)
5, 10, 15, 20, ...


B)
5, 15, 35, 75, ...


C)
5, 15, 25, 35, ...


D)
5, 20, 35, 50, ...

Respuesta :

ghanami
Hello:
an = 2an-1 + 5, where a1 = 5
n =2   a2 = 2a1 +5 = 2(5)+5 = 15
n =3  a3 = 2a2 +5 = 2(15)+5 = 35
n =4   a4 = 2a3 +5 = 235)+5 = 75
answer : 
B) 
5, 15, 35, 75, ...

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