Finite Math Examples

Find the Inverse y=x^2-2x-8
Step 1
Interchange the variables.
Step 2
Solve for .
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Step 2.1
Rewrite the equation as .
Step 2.2
Subtract from both sides of the equation.
Step 2.3
Use the quadratic formula to find the solutions.
Step 2.4
Substitute the values , , and into the quadratic formula and solve for .
Step 2.5
Simplify.
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Step 2.5.1
Simplify the numerator.
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Step 2.5.1.1
Raise to the power of .
Step 2.5.1.2
Multiply by .
Step 2.5.1.3
Apply the distributive property.
Step 2.5.1.4
Multiply by .
Step 2.5.1.5
Multiply by .
Step 2.5.1.6
Add and .
Step 2.5.1.7
Factor out of .
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Step 2.5.1.7.1
Factor out of .
Step 2.5.1.7.2
Factor out of .
Step 2.5.1.8
Rewrite as .
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Step 2.5.1.8.1
Rewrite as .
Step 2.5.1.8.2
Rewrite as .
Step 2.5.1.9
Pull terms out from under the radical.
Step 2.5.1.10
Raise to the power of .
Step 2.5.2
Multiply by .
Step 2.5.3
Simplify .
Step 2.6
Simplify the expression to solve for the portion of the .
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Step 2.6.1
Simplify the numerator.
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Step 2.6.1.1
Raise to the power of .
Step 2.6.1.2
Multiply by .
Step 2.6.1.3
Apply the distributive property.
Step 2.6.1.4
Multiply by .
Step 2.6.1.5
Multiply by .
Step 2.6.1.6
Add and .
Step 2.6.1.7
Factor out of .
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Step 2.6.1.7.1
Factor out of .
Step 2.6.1.7.2
Factor out of .
Step 2.6.1.8
Rewrite as .
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Step 2.6.1.8.1
Rewrite as .
Step 2.6.1.8.2
Rewrite as .
Step 2.6.1.9
Pull terms out from under the radical.
Step 2.6.1.10
Raise to the power of .
Step 2.6.2
Multiply by .
Step 2.6.3
Simplify .
Step 2.6.4
Change the to .
Step 2.7
Simplify the expression to solve for the portion of the .
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Step 2.7.1
Simplify the numerator.
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Step 2.7.1.1
Raise to the power of .
Step 2.7.1.2
Multiply by .
Step 2.7.1.3
Apply the distributive property.
Step 2.7.1.4
Multiply by .
Step 2.7.1.5
Multiply by .
Step 2.7.1.6
Add and .
Step 2.7.1.7
Factor out of .
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Step 2.7.1.7.1
Factor out of .
Step 2.7.1.7.2
Factor out of .
Step 2.7.1.8
Rewrite as .
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Step 2.7.1.8.1
Rewrite as .
Step 2.7.1.8.2
Rewrite as .
Step 2.7.1.9
Pull terms out from under the radical.
Step 2.7.1.10
Raise to the power of .
Step 2.7.2
Multiply by .
Step 2.7.3
Simplify .
Step 2.7.4
Change the to .
Step 2.8
The final answer is the combination of both solutions.
Step 3
Replace with to show the final answer.
Step 4
Verify if is the inverse of .
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Step 4.1
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 4.2
Find the range of .
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Step 4.2.1
The range is the set of all valid values. Use the graph to find the range.
Interval Notation:
Step 4.3
Find the domain of .
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Step 4.3.1
Set the radicand in greater than or equal to to find where the expression is defined.
Step 4.3.2
Subtract from both sides of the inequality.
Step 4.3.3
The domain is all values of that make the expression defined.
Step 4.4
Find the domain of .
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Step 4.4.1
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 4.5
Since the domain of is the range of and the range of is the domain of , then is the inverse of .
Step 5