Math Problem Statement

Use logarithms to solve the given equation. (Round the answer to four decimal places.)

9(1.055x + 1) = 10

x =

Solution

We are given the equation:

9(1.055x+1)=109(1.055^x + 1) = 10

Step 1: Isolate the exponential expression

First, we divide both sides of the equation by 9:

1.055x+1=1091.055^x + 1 = \frac{10}{9}

1.055x+1=1.11111.055^x + 1 = 1.1111

Now subtract 1 from both sides:

1.055x=0.11111.055^x = 0.1111

Step 2: Apply logarithms

To solve for xx, take the logarithm of both sides. We will use the natural logarithm (ln), though you can also use the logarithm base 10 (log):

ln(1.055x)=ln(0.1111)\ln(1.055^x) = \ln(0.1111)

Using the logarithmic property ln(ab)=bln(a)\ln(a^b) = b \cdot \ln(a), we rewrite the left-hand side:

xln(1.055)=ln(0.1111)x \cdot \ln(1.055) = \ln(0.1111)

Step 3: Solve for xx

Now, solve for xx by dividing both sides by ln(1.055)\ln(1.055):

x=ln(0.1111)ln(1.055)x = \frac{\ln(0.1111)}{\ln(1.055)}

Step 4: Calculate the result

Let me calculate this value for you.The value of xx, rounded to four decimal places, is approximately 41.0402-41.0402.

Would you like more details on this process or have any questions?

Here are 5 related questions you could explore:

  1. How do logarithmic properties help in solving exponential equations?
  2. Can logarithms with different bases (e.g., base 10 vs. natural log) lead to the same solution?
  3. What is the significance of the base in the exponential equation?
  4. How does the value of xx change if the base 1.055 were larger or smaller?
  5. How can logarithms be used to simplify more complex exponential equations?

Tip: When solving exponential equations, using logarithms allows us to "bring down" the exponent, making the equation linear and easier to solve.

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Math Problem Analysis

Mathematical Concepts

Exponential Equations
Logarithms
Algebra

Formulas

Logarithmic Property: ln(a^b) = b * ln(a)
Exponential Equation: a^x = b

Theorems

Logarithmic Theorem: log_b(a) = x is equivalent to b^x = a
Logarithmic Properties for Simplification

Suitable Grade Level

Grades 10-12