Math Problem Statement

Find the first three terms of the sequence defined below, where n represents the position of a term in the sequence. Start with n = 1.

an = 4(2)n

, , 

Solution

The sequence is given by the formula:

an=4(2)na_n = 4(2)^n

Where nn represents the position of a term in the sequence.

We will calculate the first three terms of the sequence by substituting n=1,2,3n = 1, 2, 3 into the formula.

For n=1n = 1:

a1=4(2)1=4×2=8a_1 = 4(2)^1 = 4 \times 2 = 8

For n=2n = 2:

a2=4(2)2=4×4=16a_2 = 4(2)^2 = 4 \times 4 = 16

For n=3n = 3:

a3=4(2)3=4×8=32a_3 = 4(2)^3 = 4 \times 8 = 32

Thus, the first three terms of the sequence are:

8,16,328, 16, 32

Would you like further clarification or details about how I arrived at these terms? Here are a few related questions to explore:

  1. How would the sequence change if the formula was an=3(2)na_n = 3(2)^n?
  2. What is the general behavior of exponential sequences like this one?
  3. How can you prove that an=4(2)na_n = 4(2)^n grows exponentially?
  4. What is the sum of the first five terms of this sequence?
  5. How would the sequence behave if you had a negative exponent (e.g., an=4(2)na_n = 4(2)^{-n})?

Tip: When dealing with exponential sequences, always pay attention to the base of the exponent. The base 2 in this case makes the sequence grow quickly as nn increases.

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Math Problem Analysis

Mathematical Concepts

Sequences
Exponential Functions

Formulas

a_n = 4(2)^n

Theorems

Exponential growth

Suitable Grade Level

Grades 7-9