How Do You Start Solving a Logarithmic Equation?

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In summary, a log equation is an equation involving logarithms which are used to solve for unknown values in exponential equations. To solve a log equation, one can use the properties of logarithms and the inverse property. The steps to solve a log equation are simplifying, isolating, converting, solving, and checking. Log equations can have multiple solutions, but it is important to check for extraneous solutions. Log equations have many real-life applications in finance, population growth and decay, science and engineering, and more.
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Homework Statement


Solve the logarithmic equation for x:
Log2 (x^2 - x - 2) = 2

Homework Equations





The Attempt at a Solution



I'm just totally lost on how to even start...
 
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  • #2
Hint: if : Log2 (z) = 2, then z=2^2=4.
 
  • #3
Solved it. Totally forgot that if you put log base 2 as the power of 2, they cancel!
 

FAQ: How Do You Start Solving a Logarithmic Equation?

What is a log equation?

A log equation is an equation that involves the mathematical operation of logarithms. Logarithms are used to solve for unknown values in exponential equations.

How do you solve a log equation?

To solve a log equation, you can use the properties of logarithms, such as the product rule, quotient rule, and power rule. You can also use the inverse property of logarithms, which states that log base a of a to the power of x is equal to x.

What are the steps to solve a log equation?

The steps to solve a log equation are as follows:

  1. Use the properties of logarithms to simplify the equation.
  2. Isolate the logarithmic term on one side of the equation.
  3. Convert the logarithmic equation into an exponential equation.
  4. Solve for the unknown variable.
  5. Check your solution by plugging it back into the original equation.

Can a log equation have multiple solutions?

Yes, a log equation can have multiple solutions. This is because logarithms are not one-to-one functions, meaning that different inputs can result in the same output. However, it is important to check your solutions and determine which ones are extraneous.

What are some real-life applications of log equations?

Log equations have many real-life applications, such as in finance, population growth and decay, sound and light intensity, and pH calculations. They are also used in science and engineering to model exponential growth and decay in natural processes.

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