Ryan Davey
09/06/2024 · Elementary School
Find the \( 11^{\text {th }} \) term of the following geometric sequence. \[ 4,8,16,32, \ldots \]
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Step-by-step Solution
To find the 11th term of a geometric sequence, we need to know the first term and the common ratio.
Given geometric sequence: \(4, 8, 16, 32, \ldots\)
The first term (\(a\)) is 4, and the common ratio (\(r\)) can be found by dividing any term by the previous term. Let's find the common ratio:
\(r = \frac{8}{4} = 2\)
Now, we can use the formula for the nth term of a geometric sequence:
\(a_n = a \cdot r^{n-1}\)
where:
- \(a_n\) is the nth term
- \(a\) is the first term
- \(r\) is the common ratio
- \(n\) is the term number
Substitute the values we have:
- \(a = 4\)
- \(r = 2\)
- \(n = 11\)
\(a_{11} = 4 \cdot 2^{11-1}\)
Now, we can calculate the 11th term.
Calculate the value by following steps:
- step0: Calculate:
\(4\times 2^{11-1}\)
- step1: Subtract the numbers:
\(4\times 2^{10}\)
- step2: Rewrite the expression:
\(2^{2}\times 2^{10}\)
- step3: Calculate:
\(2^{12}\)
- step4: Evaluate the power:
\(4096\)
Quick Answer
\(a_{11} = 4 \cdot 2^{10}\)
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