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Precalculus Examples
Step 1
Write as an equation.
Step 2
Interchange the variables.
Step 3
Step 3.1
Rewrite the equation as .
Step 3.2
Find the LCD of the terms in the equation.
Step 3.2.1
Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.
Step 3.2.2
Remove parentheses.
Step 3.2.3
The LCM of one and any expression is the expression.
Step 3.3
Multiply each term in by to eliminate the fractions.
Step 3.3.1
Multiply each term in by .
Step 3.3.2
Simplify the left side.
Step 3.3.2.1
Cancel the common factor of .
Step 3.3.2.1.1
Cancel the common factor.
Step 3.3.2.1.2
Rewrite the expression.
Step 3.3.3
Simplify the right side.
Step 3.3.3.1
Apply the distributive property.
Step 3.3.3.2
Move to the left of .
Step 3.4
Solve the equation.
Step 3.4.1
Rewrite the equation as .
Step 3.4.2
Add to both sides of the equation.
Step 3.4.3
Divide each term in by and simplify.
Step 3.4.3.1
Divide each term in by .
Step 3.4.3.2
Simplify the left side.
Step 3.4.3.2.1
Cancel the common factor of .
Step 3.4.3.2.1.1
Cancel the common factor.
Step 3.4.3.2.1.2
Divide by .
Step 3.4.3.3
Simplify the right side.
Step 3.4.3.3.1
Cancel the common factor of .
Step 3.4.3.3.1.1
Cancel the common factor.
Step 3.4.3.3.1.2
Divide by .
Step 4
Replace with to show the final answer.
Step 5
Step 5.1
To verify the inverse, check if and .
Step 5.2
Evaluate .
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
Simplify each term.
Step 5.2.3.1
Multiply the numerator by the reciprocal of the denominator.
Step 5.2.3.2
Cancel the common factor of .
Step 5.2.3.2.1
Cancel the common factor.
Step 5.2.3.2.2
Rewrite the expression.
Step 5.2.4
Combine the opposite terms in .
Step 5.2.4.1
Add and .
Step 5.2.4.2
Add and .
Step 5.3
Evaluate .
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
Simplify the denominator.
Step 5.3.3.1
Subtract from .
Step 5.3.3.2
Add and .
Step 5.3.4
Multiply the numerator by the reciprocal of the denominator.
Step 5.3.5
Cancel the common factor of .
Step 5.3.5.1
Cancel the common factor.
Step 5.3.5.2
Rewrite the expression.
Step 5.4
Since and , then is the inverse of .