Precalculus Examples

Find the Average Rate of Change f(x)=(x-6)/(x+4) on [1,7]
on
Step 1
Write as an equation.
Step 2
Substitute using the average rate of change formula.
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Step 2.1
The average rate of change of a function can be found by calculating the change in values of the two points divided by the change in values of the two points.
Step 2.2
Substitute the equation for and , replacing in the function with the corresponding value.
Step 3
Simplify the expression.
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Step 3.1
Multiply the numerator and denominator of the fraction by .
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Step 3.1.1
Multiply by .
Step 3.1.2
Combine.
Step 3.2
Apply the distributive property.
Step 3.3
Simplify by cancelling.
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Step 3.3.1
Cancel the common factor of .
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Step 3.3.1.1
Cancel the common factor.
Step 3.3.1.2
Rewrite the expression.
Step 3.3.2
Cancel the common factor of .
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Step 3.3.2.1
Move the leading negative in into the numerator.
Step 3.3.2.2
Factor out of .
Step 3.3.2.3
Cancel the common factor.
Step 3.3.2.4
Rewrite the expression.
Step 3.4
Simplify the numerator.
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Step 3.4.1
Add and .
Step 3.4.2
Subtract from .
Step 3.4.3
Multiply by .
Step 3.4.4
Add and .
Step 3.4.5
Subtract from .
Step 3.4.6
Multiply .
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Step 3.4.6.1
Multiply by .
Step 3.4.6.2
Multiply by .
Step 3.4.7
Add and .
Step 3.5
Simplify the denominator.
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Step 3.5.1
Add and .
Step 3.5.2
Add and .
Step 3.5.3
Multiply .
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Step 3.5.3.1
Multiply by .
Step 3.5.3.2
Multiply by .
Step 3.5.4
Add and .
Step 3.5.5
Add and .
Step 3.5.6
Multiply .
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Step 3.5.6.1
Multiply by .
Step 3.5.6.2
Multiply by .
Step 3.5.6.3
Multiply by .
Step 3.5.7
Subtract from .
Step 3.6
Cancel the common factor of and .
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Step 3.6.1
Factor out of .
Step 3.6.2
Cancel the common factors.
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Step 3.6.2.1
Factor out of .
Step 3.6.2.2
Cancel the common factor.
Step 3.6.2.3
Rewrite the expression.