Math Problem Statement

find the x and y intercepts of g(x) = 2 log (5(x-1))+4

Solution

To find the xx- and yy-intercepts of the function g(x)=2log(5(x1))+4g(x) = 2\log\left(5(x-1)\right) + 4, we will follow these steps:

1. Find the yy-Intercept

The yy-intercept occurs where x=0x = 0.

Substitute x=0x = 0 into the function: g(0)=2log(5(01))+4=2log(5)+4g(0) = 2\log\left(5(0-1)\right) + 4 = 2\log(-5) + 4

However, the logarithm of a negative number is undefined in the real number system. Therefore, there is no yy-intercept for this function.

2. Find the xx-Intercept

The xx-intercept occurs where g(x)=0g(x) = 0.

Set the function equal to zero: 2log(5(x1))+4=02\log\left(5(x-1)\right) + 4 = 0

Subtract 4 from both sides: 2log(5(x1))=42\log\left(5(x-1)\right) = -4

Divide both sides by 2: log(5(x1))=2\log\left(5(x-1)\right) = -2

Rewrite the equation in exponential form: 5(x1)=1025(x-1) = 10^{-2}

Simplify 10210^{-2} to get: 5(x1)=11005(x-1) = \frac{1}{100}

Divide both sides by 5: x1=1500x-1 = \frac{1}{500}

Add 1 to both sides: x=1+1500=500500+1500=501500x = 1 + \frac{1}{500} = \frac{500}{500} + \frac{1}{500} = \frac{501}{500}

Final Answers:

  • yy-intercept: None (because the logarithm of a negative number is undefined).
  • xx-intercept: x=501500x = \frac{501}{500} or approximately x=1.002x = 1.002.

Would you like more details on any step or have any other questions?

Here are some related questions you might find interesting:

  1. What are the domain and range of g(x)=2log(5(x1))+4g(x) = 2\log\left(5(x-1)\right) + 4?
  2. How would the function change if the base of the logarithm were different?
  3. Can we find asymptotes for the function g(x)g(x)?
  4. What are the critical points of g(x)=2log(5(x1))+4g(x) = 2\log\left(5(x-1)\right) + 4?
  5. How would you graph this function?
  6. What happens to the intercepts if we add a constant to the function?
  7. How does the function behave as xx approaches infinity?
  8. What are the transformations applied to the base function log(x)\log(x) in this equation?

Tip: When solving logarithmic equations, always check the domain to avoid taking the logarithm of a negative number or zero.

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Math Problem Analysis

Mathematical Concepts

Logarithms

Formulas

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Theorems

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Suitable Grade Level

Grades 10-12