Calculus Examples

Find the Inverse f(x) = square root of 1-9x
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
To remove the radical on the left side of the equation, square both sides of the equation.
Step 3.3
Simplify each side of the equation.
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Step 3.3.1
Use to rewrite as .
Step 3.3.2
Simplify the left side.
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Step 3.3.2.1
Simplify .
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Step 3.3.2.1.1
Multiply the exponents in .
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Step 3.3.2.1.1.1
Apply the power rule and multiply exponents, .
Step 3.3.2.1.1.2
Cancel the common factor of .
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Step 3.3.2.1.1.2.1
Cancel the common factor.
Step 3.3.2.1.1.2.2
Rewrite the expression.
Step 3.3.2.1.2
Simplify.
Step 3.4
Solve for .
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Step 3.4.1
Subtract from both sides of the equation.
Step 3.4.2
Divide each term in by and simplify.
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Step 3.4.2.1
Divide each term in by .
Step 3.4.2.2
Simplify the left side.
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Step 3.4.2.2.1
Cancel the common factor of .
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Step 3.4.2.2.1.1
Cancel the common factor.
Step 3.4.2.2.1.2
Divide by .
Step 3.4.2.3
Simplify the right side.
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Step 3.4.2.3.1
Simplify each term.
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Step 3.4.2.3.1.1
Move the negative in front of the fraction.
Step 3.4.2.3.1.2
Dividing two negative values results in a positive value.
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 numerators over the common denominator.
Step 5.2.4
Simplify each term.
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Step 5.2.4.1
Rewrite as .
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Step 5.2.4.1.1
Use to rewrite as .
Step 5.2.4.1.2
Apply the power rule and multiply exponents, .
Step 5.2.4.1.3
Combine and .
Step 5.2.4.1.4
Cancel the common factor of .
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Step 5.2.4.1.4.1
Cancel the common factor.
Step 5.2.4.1.4.2
Rewrite the expression.
Step 5.2.4.1.5
Simplify.
Step 5.2.4.2
Apply the distributive property.
Step 5.2.4.3
Multiply by .
Step 5.2.4.4
Multiply by .
Step 5.2.5
Simplify terms.
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Step 5.2.5.1
Combine the opposite terms in .
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Step 5.2.5.1.1
Add and .
Step 5.2.5.1.2
Add and .
Step 5.2.5.2
Cancel the common factor of .
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Step 5.2.5.2.1
Cancel the common factor.
Step 5.2.5.2.2
Divide by .
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
Apply the distributive property.
Step 5.3.4
Cancel the common factor of .
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Step 5.3.4.1
Move the leading negative in into the numerator.
Step 5.3.4.2
Factor out of .
Step 5.3.4.3
Cancel the common factor.
Step 5.3.4.4
Rewrite the expression.
Step 5.3.5
Multiply.
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Step 5.3.5.1
Multiply by .
Step 5.3.5.2
Multiply by .
Step 5.3.6
Cancel the common factor of .
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Step 5.3.6.1
Factor out of .
Step 5.3.6.2
Cancel the common factor.
Step 5.3.6.3
Rewrite the expression.
Step 5.3.7
Simplify by subtracting numbers.
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Step 5.3.7.1
Subtract from .
Step 5.3.7.2
Add and .
Step 5.3.8
Pull terms out from under the radical, assuming positive real numbers.
Step 5.4
Since and , then is the inverse of .