Question

Find a formula for a geometric sequence that begins with 7, 35, 175,...

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Answer 1

b

Explanation:

a = 7

r = 35/7 = 5

a × r^(n-1)

7 × 5^(n-1)

Answer 2

b bn = 7 (5)^ (n-1)

Explanation:

First we need to find the ration

Take the second term and divide by the first term

35/7 = 5

The formula for the sequence is given by

an = a0 (r) ^(n-1)

where a0 is the first term, r is the ratio

an = 7 (5)^ (n-1)