Finite Math Examples

Find the Inverse f(x) = log base 3 of x-4+2
Step 1
Write as an equation.
Step 2
Interchange the variables.
Step 3
Solve for .
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Step 3.1
Rewrite the equation as .
Step 3.2
Subtract from both sides of the equation.
Step 3.3
Rewrite in exponential form using the definition of a logarithm. If and are positive real numbers and , then is equivalent to .
Step 3.4
Solve for .
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Step 3.4.1
Rewrite the equation as .
Step 3.4.2
Add to both sides of the equation.
Step 4
Replace with to show the final answer.
Step 5
Verify if is the inverse of .
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Step 5.1
To verify the inverse, check if and .
Step 5.2
Evaluate .
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Step 5.2.1
Set up the composite result function.
Step 5.2.2
Evaluate by substituting in the value of into .
Step 5.2.3
Combine the opposite terms in .
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Step 5.2.3.1
Subtract from .
Step 5.2.3.2
Add and .
Step 5.2.4
Exponentiation and log are inverse functions.
Step 5.2.5
Combine the opposite terms in .
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Step 5.2.5.1
Add and .
Step 5.2.5.2
Add and .
Step 5.3
Evaluate .
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Step 5.3.1
Set up the composite result function.
Step 5.3.2
Evaluate by substituting in the value of into .
Step 5.3.3
Combine the opposite terms in .
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Step 5.3.3.1
Subtract from .
Step 5.3.3.2
Add and .
Step 5.3.4
Simplify each term.
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Step 5.3.4.1
Use logarithm rules to move out of the exponent.
Step 5.3.4.2
Logarithm base of is .
Step 5.3.4.3
Multiply by .
Step 5.3.5
Combine the opposite terms in .
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Step 5.3.5.1
Add and .
Step 5.3.5.2
Add and .
Step 5.4
Since and , then is the inverse of .