Calculus Examples

Find the Area Between the Curves y=4x-x^2 , y=0 , x=1 , x=3
, , ,
Step 1
Solve by substitution to find the intersection between the curves.
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Step 1.1
Eliminate the equal sides of each equation and combine.
Step 1.2
Solve for .
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Step 1.2.1
Factor the left side of the equation.
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Step 1.2.1.1
Let . Substitute for all occurrences of .
Step 1.2.1.2
Factor out of .
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Step 1.2.1.2.1
Factor out of .
Step 1.2.1.2.2
Factor out of .
Step 1.2.1.2.3
Factor out of .
Step 1.2.1.3
Replace all occurrences of with .
Step 1.2.2
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 1.2.3
Set equal to .
Step 1.2.4
Set equal to and solve for .
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Step 1.2.4.1
Set equal to .
Step 1.2.4.2
Solve for .
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Step 1.2.4.2.1
Subtract from both sides of the equation.
Step 1.2.4.2.2
Divide each term in by and simplify.
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Step 1.2.4.2.2.1
Divide each term in by .
Step 1.2.4.2.2.2
Simplify the left side.
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Step 1.2.4.2.2.2.1
Dividing two negative values results in a positive value.
Step 1.2.4.2.2.2.2
Divide by .
Step 1.2.4.2.2.3
Simplify the right side.
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Step 1.2.4.2.2.3.1
Divide by .
Step 1.2.5
The final solution is all the values that make true.
Step 1.3
Substitute for .
Step 1.4
The solution to the system is the complete set of ordered pairs that are valid solutions.
Step 2
Reorder and .
Step 3
The area of the region between the curves is defined as the integral of the upper curve minus the integral of the lower curve over each region. The regions are determined by the intersection points of the curves. This can be done algebraically or graphically.
Step 4
Integrate to find the area between and .
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Step 4.1
Combine the integrals into a single integral.
Step 4.2
Subtract from .
Step 4.3
Split the single integral into multiple integrals.
Step 4.4
Since is constant with respect to , move out of the integral.
Step 4.5
By the Power Rule, the integral of with respect to is .
Step 4.6
Combine and .
Step 4.7
Since is constant with respect to , move out of the integral.
Step 4.8
By the Power Rule, the integral of with respect to is .
Step 4.9
Simplify the answer.
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Step 4.9.1
Combine and .
Step 4.9.2
Substitute and simplify.
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Step 4.9.2.1
Evaluate at and at .
Step 4.9.2.2
Evaluate at and at .
Step 4.9.2.3
Simplify.
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Step 4.9.2.3.1
Raise to the power of .
Step 4.9.2.3.2
Cancel the common factor of and .
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Step 4.9.2.3.2.1
Factor out of .
Step 4.9.2.3.2.2
Cancel the common factors.
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Step 4.9.2.3.2.2.1
Factor out of .
Step 4.9.2.3.2.2.2
Cancel the common factor.
Step 4.9.2.3.2.2.3
Rewrite the expression.
Step 4.9.2.3.2.2.4
Divide by .
Step 4.9.2.3.3
One to any power is one.
Step 4.9.2.3.4
To write as a fraction with a common denominator, multiply by .
Step 4.9.2.3.5
Combine and .
Step 4.9.2.3.6
Combine the numerators over the common denominator.
Step 4.9.2.3.7
Simplify the numerator.
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Step 4.9.2.3.7.1
Multiply by .
Step 4.9.2.3.7.2
Subtract from .
Step 4.9.2.3.8
Raise to the power of .
Step 4.9.2.3.9
One to any power is one.
Step 4.9.2.3.10
Combine the numerators over the common denominator.
Step 4.9.2.3.11
Subtract from .
Step 4.9.2.3.12
Cancel the common factor of and .
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Step 4.9.2.3.12.1
Factor out of .
Step 4.9.2.3.12.2
Cancel the common factors.
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Step 4.9.2.3.12.2.1
Factor out of .
Step 4.9.2.3.12.2.2
Cancel the common factor.
Step 4.9.2.3.12.2.3
Rewrite the expression.
Step 4.9.2.3.12.2.4
Divide by .
Step 4.9.2.3.13
Multiply by .
Step 4.9.2.3.14
To write as a fraction with a common denominator, multiply by .
Step 4.9.2.3.15
Combine and .
Step 4.9.2.3.16
Combine the numerators over the common denominator.
Step 4.9.2.3.17
Simplify the numerator.
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Step 4.9.2.3.17.1
Multiply by .
Step 4.9.2.3.17.2
Add and .
Step 5