Math Problem Statement

What are the x- and y-intercepts of the equation?

y=log(3x+4)+2

Round only the final answers to the nearest hundredth.

Enter your answers in the boxes.

x-intercept = y-intercept =

Solution

To find the intercepts of the equation y=log(3x+4)+2y = \log(3x + 4) + 2, we proceed as follows:

1. Finding the y-intercept:

The y-intercept occurs when x=0x = 0.

Substitute x=0x = 0 into the equation: y=log(3(0)+4)+2=log(4)+2y = \log(3(0) + 4) + 2 = \log(4) + 2

Now calculate log(4)\log(4) using base 10: log(4)0.6021\log(4) \approx 0.6021

So, y0.6021+2=2.6021y \approx 0.6021 + 2 = 2.6021

Rounded to the nearest hundredth, the y-intercept is: y2.60y \approx 2.60

2. Finding the x-intercept:

The x-intercept occurs when y=0y = 0.

Set y=0y = 0 in the equation: 0=log(3x+4)+20 = \log(3x + 4) + 2

To isolate the logarithmic term, subtract 2 from both sides: 2=log(3x+4)-2 = \log(3x + 4)

Convert the logarithmic equation to its exponential form: 102=3x+410^{-2} = 3x + 4

Now solve for xx: 0.01=3x+40.01 = 3x + 4 3x=0.014=3.993x = 0.01 - 4 = -3.99 x=3.9931.33x = \frac{-3.99}{3} \approx -1.33

Rounded to the nearest hundredth, the x-intercept is: x1.33x \approx -1.33

Final Answers:

  • x-intercept 1.33\approx -1.33
  • y-intercept 2.60\approx 2.60

Would you like more details on any part of the solution?


5 Related Questions:

  1. How do you find intercepts for exponential functions?
  2. What is the general process for converting logarithmic equations to exponential form?
  3. How does changing the base of a logarithm affect the intercepts?
  4. What happens to the graph if we change the equation to y=log(3x+4)2y = \log(3x + 4) - 2?
  5. Can you explain how to find the intercepts of a function with a natural logarithm?

Tip: When solving for intercepts, always remember that the y-intercept occurs where x=0x = 0 and the x-intercept occurs where y=0y = 0.

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Math Problem Analysis

Mathematical Concepts

Logarithms

Formulas

Logarithm properties
Exponential form conversion

Theorems

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Suitable Grade Level

Grades 11-12