Finite Math Examples

Find the Inverse f(x)=x^2-1x-30
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
Rewrite as .
Step 3.3
Subtract from both sides of the equation.
Step 3.4
Use the quadratic formula to find the solutions.
Step 3.5
Substitute the values , , and into the quadratic formula and solve for .
Step 3.6
Simplify.
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Step 3.6.1
Simplify the numerator.
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Step 3.6.1.1
Raise to the power of .
Step 3.6.1.2
Multiply by .
Step 3.6.1.3
Apply the distributive property.
Step 3.6.1.4
Multiply by .
Step 3.6.1.5
Multiply by .
Step 3.6.1.6
Add and .
Step 3.6.2
Multiply by .
Step 3.7
Simplify the expression to solve for the portion of the .
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Step 3.7.1
Simplify the numerator.
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Step 3.7.1.1
Raise to the power of .
Step 3.7.1.2
Multiply by .
Step 3.7.1.3
Apply the distributive property.
Step 3.7.1.4
Multiply by .
Step 3.7.1.5
Multiply by .
Step 3.7.1.6
Add and .
Step 3.7.2
Multiply by .
Step 3.7.3
Change the to .
Step 3.8
Simplify the expression to solve for the portion of the .
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Step 3.8.1
Simplify the numerator.
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Step 3.8.1.1
Raise to the power of .
Step 3.8.1.2
Multiply by .
Step 3.8.1.3
Apply the distributive property.
Step 3.8.1.4
Multiply by .
Step 3.8.1.5
Multiply by .
Step 3.8.1.6
Add and .
Step 3.8.2
Multiply by .
Step 3.8.3
Change the to .
Step 3.9
The final answer is the combination of both solutions.
Step 4
Replace with to show the final answer.
Step 5
Verify if is the inverse of .
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Step 5.1
The domain of the inverse is the range of the original function and vice versa. Find the domain and the range of and and compare them.
Step 5.2
Find the range of .
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Step 5.2.1
The range is the set of all valid values. Use the graph to find the range.
Interval Notation:
Step 5.3
Find the domain of .
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Step 5.3.1
Set the radicand in greater than or equal to to find where the expression is defined.
Step 5.3.2
Solve for .
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Step 5.3.2.1
Subtract from both sides of the inequality.
Step 5.3.2.2
Divide each term in by and simplify.
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Step 5.3.2.2.1
Divide each term in by .
Step 5.3.2.2.2
Simplify the left side.
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Step 5.3.2.2.2.1
Cancel the common factor of .
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Step 5.3.2.2.2.1.1
Cancel the common factor.
Step 5.3.2.2.2.1.2
Divide by .
Step 5.3.2.2.3
Simplify the right side.
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Step 5.3.2.2.3.1
Move the negative in front of the fraction.
Step 5.3.3
The domain is all values of that make the expression defined.
Step 5.4
Find the domain of .
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Step 5.4.1
The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.
Step 5.5
Since the domain of is the range of and the range of is the domain of , then is the inverse of .
Step 6