Math Problem Statement

Find an exact solution for   ln(6)+ln(6x2−3)=ln(151)ln6+ln6x2−3=ln151.

Solution

Let's solve the equation step by step.

The given equation is:

ln(6)+ln(6x23)=ln(151)\ln(6) + \ln(6x^2 - 3) = \ln(151)

Step 1: Use the logarithmic property

We can use the logarithmic property:

ln(a)+ln(b)=ln(ab)\ln(a) + \ln(b) = \ln(a \cdot b)

Applying this property:

ln(6)+ln(6x23)=ln(6(6x23))\ln(6) + \ln(6x^2 - 3) = \ln(6(6x^2 - 3))

So the equation becomes:

ln(6(6x23))=ln(151)\ln(6(6x^2 - 3)) = \ln(151)

Step 2: Remove the logarithms

Since we have ln(something)=ln(something else)\ln(\text{something}) = \ln(\text{something else}), we can drop the logarithms, which gives us the equation:

6(6x23)=1516(6x^2 - 3) = 151

Step 3: Expand and simplify

Now, expand the left-hand side:

6(6x23)=36x2186(6x^2 - 3) = 36x^2 - 18

So the equation becomes:

36x218=15136x^2 - 18 = 151

Step 4: Solve for x2x^2

Add 18 to both sides:

36x2=151+1836x^2 = 151 + 18 36x2=16936x^2 = 169

Now, divide both sides by 36:

x2=16936x^2 = \frac{169}{36}

Step 5: Take the square root

Take the square root of both sides:

x=±16936=±16936=±136x = \pm \sqrt{\frac{169}{36}} = \pm \frac{\sqrt{169}}{\sqrt{36}} = \pm \frac{13}{6}

Final Solution:

The exact solutions are:

x=136orx=136x = \frac{13}{6} \quad \text{or} \quad x = -\frac{13}{6}

Do you want more details or have any questions?

Here are 5 related questions you can explore:

  1. How do you solve logarithmic equations with different bases?
  2. What are the key properties of logarithms?
  3. How can we apply logarithms to exponential functions?
  4. Can we solve this equation graphically?
  5. What are the applications of logarithmic equations in real life?

Tip: When solving logarithmic equations, always ensure the arguments inside the logarithms are positive.

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Math Problem Analysis

Mathematical Concepts

Logarithms
Algebra
Quadratic Equations

Formulas

ln(a) + ln(b) = ln(a * b)
Quadratic equation formula: ax^2 + bx + c = 0

Theorems

Logarithmic property: ln(a) + ln(b) = ln(ab)
Quadratic formula: x = (-b ± √(b^2 - 4ac)) / 2a

Suitable Grade Level

Grades 9-12