Math Problem Statement

If a₁ = 10 and aₙ = aₙ₋₁ / 4 + 3, find the value of a₃.

Solution

Let's analyze the problem based on the image you uploaded:

The recursive sequence is given as:

a1=10andan=an14+3.a_1 = 10 \quad \text{and} \quad a_n = \frac{a_{n-1}}{4} + 3.

You are asked to find the value of a3a_3.

Step-by-step solution:

  1. Calculate a2a_2: Using the recursive formula an=an14+3a_n = \frac{a_{n-1}}{4} + 3 for n=2n = 2: a2=a14+3=104+3=2.5+3=5.5.a_2 = \frac{a_1}{4} + 3 = \frac{10}{4} + 3 = 2.5 + 3 = 5.5.

  2. Calculate a3a_3: Now, apply the formula again for n=3n = 3: a3=a24+3=5.54+3=1.375+3=4.375.a_3 = \frac{a_2}{4} + 3 = \frac{5.5}{4} + 3 = 1.375 + 3 = 4.375.

Thus, the value of a3a_3 is 4.375.

Would you like more details on recursive sequences or further clarifications?

Here are five related questions for you to consider:

  1. How do recursive sequences differ from arithmetic and geometric sequences?
  2. Can you find a4a_4 using the same formula?
  3. What happens to the value of ana_n as nn increases in this sequence?
  4. How would the sequence change if the constant in the formula were different (e.g., +5+ 5 instead of +3+ 3)?
  5. Could you express ana_n as a non-recursive (explicit) formula?

Tip: When dealing with recursive sequences, start by calculating a few initial terms to identify any patterns before generalizing.

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Math Problem Analysis

Mathematical Concepts

Recursive Sequences
Algebra

Formulas

aₙ = aₙ₋₁ / 4 + 3

Theorems

Recursive Formula

Suitable Grade Level

Grades 9-12