Calculus Examples

Find the Area Between the Curves y=x^2+9x-4 , y=x+2
,
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
Move all terms containing to the left side of the equation.
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Step 1.2.1.1
Subtract from both sides of the equation.
Step 1.2.1.2
Subtract from .
Step 1.2.2
Move all terms to the left side of the equation and simplify.
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Step 1.2.2.1
Subtract from both sides of the equation.
Step 1.2.2.2
Subtract from .
Step 1.2.3
Use the quadratic formula to find the solutions.
Step 1.2.4
Substitute the values , , and into the quadratic formula and solve for .
Step 1.2.5
Simplify.
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Step 1.2.5.1
Simplify the numerator.
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Step 1.2.5.1.1
Raise to the power of .
Step 1.2.5.1.2
Multiply .
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Step 1.2.5.1.2.1
Multiply by .
Step 1.2.5.1.2.2
Multiply by .
Step 1.2.5.1.3
Add and .
Step 1.2.5.1.4
Rewrite as .
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Step 1.2.5.1.4.1
Factor out of .
Step 1.2.5.1.4.2
Rewrite as .
Step 1.2.5.1.5
Pull terms out from under the radical.
Step 1.2.5.2
Multiply by .
Step 1.2.5.3
Simplify .
Step 1.2.6
Simplify the expression to solve for the portion of the .
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Step 1.2.6.1
Simplify the numerator.
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Step 1.2.6.1.1
Raise to the power of .
Step 1.2.6.1.2
Multiply .
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Step 1.2.6.1.2.1
Multiply by .
Step 1.2.6.1.2.2
Multiply by .
Step 1.2.6.1.3
Add and .
Step 1.2.6.1.4
Rewrite as .
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Step 1.2.6.1.4.1
Factor out of .
Step 1.2.6.1.4.2
Rewrite as .
Step 1.2.6.1.5
Pull terms out from under the radical.
Step 1.2.6.2
Multiply by .
Step 1.2.6.3
Simplify .
Step 1.2.6.4
Change the to .
Step 1.2.7
Simplify the expression to solve for the portion of the .
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Step 1.2.7.1
Simplify the numerator.
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Step 1.2.7.1.1
Raise to the power of .
Step 1.2.7.1.2
Multiply .
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Step 1.2.7.1.2.1
Multiply by .
Step 1.2.7.1.2.2
Multiply by .
Step 1.2.7.1.3
Add and .
Step 1.2.7.1.4
Rewrite as .
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Step 1.2.7.1.4.1
Factor out of .
Step 1.2.7.1.4.2
Rewrite as .
Step 1.2.7.1.5
Pull terms out from under the radical.
Step 1.2.7.2
Multiply by .
Step 1.2.7.3
Simplify .
Step 1.2.7.4
Change the to .
Step 1.2.8
The final answer is the combination of both solutions.
Step 1.3
Evaluate when .
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Step 1.3.1
Substitute for .
Step 1.3.2
Substitute for in and solve for .
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Step 1.3.2.1
Remove parentheses.
Step 1.3.2.2
Remove parentheses.
Step 1.3.2.3
Add and .
Step 1.4
Evaluate when .
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Step 1.4.1
Substitute for .
Step 1.4.2
Substitute for in and solve for .
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Step 1.4.2.1
Remove parentheses.
Step 1.4.2.2
Remove parentheses.
Step 1.4.2.3
Add and .
Step 1.5
The solution to the system is the complete set of ordered pairs that are valid solutions.
Step 2
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 3
Integrate to find the area between and .
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Step 3.1
Combine the integrals into a single integral.
Step 3.2
Simplify each term.
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Step 3.2.1
Apply the distributive property.
Step 3.2.2
Simplify.
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Step 3.2.2.1
Multiply by .
Step 3.2.2.2
Multiply by .
Step 3.3
Simplify by adding terms.
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Step 3.3.1
Subtract from .
Step 3.3.2
Add and .
Step 3.4
Split the single integral into multiple integrals.
Step 3.5
Since is constant with respect to , move out of the integral.
Step 3.6
By the Power Rule, the integral of with respect to is .
Step 3.7
Combine and .
Step 3.8
Since is constant with respect to , move out of the integral.
Step 3.9
By the Power Rule, the integral of with respect to is .
Step 3.10
Combine and .
Step 3.11
Apply the constant rule.
Step 3.12
Simplify the answer.
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Step 3.12.1
Substitute and simplify.
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Step 3.12.1.1
Evaluate at and at .
Step 3.12.1.2
Evaluate at and at .
Step 3.12.1.3
Evaluate at and at .
Step 3.12.1.4
Simplify.
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Step 3.12.1.4.1
Combine the numerators over the common denominator.
Step 3.12.1.4.2
Combine and .
Step 3.12.1.4.3
Cancel the common factor of and .
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Step 3.12.1.4.3.1
Factor out of .
Step 3.12.1.4.3.2
Cancel the common factors.
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Step 3.12.1.4.3.2.1
Factor out of .
Step 3.12.1.4.3.2.2
Cancel the common factor.
Step 3.12.1.4.3.2.3
Rewrite the expression.
Step 3.12.1.4.3.2.4
Divide by .
Step 3.12.1.4.4
Combine the numerators over the common denominator.
Step 3.12.1.4.5
To write as a fraction with a common denominator, multiply by .
Step 3.12.1.4.6
Combine and .
Step 3.12.1.4.7
Combine the numerators over the common denominator.
Step 3.12.1.4.8
Multiply by .
Step 3.12.1.4.9
To write as a fraction with a common denominator, multiply by .
Step 3.12.1.4.10
Combine and .
Step 3.12.1.4.11
Combine the numerators over the common denominator.
Step 3.12.1.4.12
Multiply by .
Step 3.12.1.4.13
To write as a fraction with a common denominator, multiply by .
Step 3.12.1.4.14
Combine and .
Step 3.12.1.4.15
Combine the numerators over the common denominator.
Step 3.12.1.4.16
Multiply by .
Step 3.12.2
Simplify.
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Step 3.12.2.1
Factor out of .
Step 3.12.2.2
Factor out of .
Step 3.12.2.3
Factor out of .
Step 3.12.2.4
Factor out of .
Step 3.12.2.5
Factor out of .
Step 3.12.2.6
Factor out of .
Step 3.12.2.7
Rewrite as .
Step 3.12.2.8
Move the negative in front of the fraction.
Step 3.12.3
Simplify.
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Step 3.12.3.1
Rewrite as .
Step 3.12.3.2
Expand using the FOIL Method.
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Step 3.12.3.2.1
Apply the distributive property.
Step 3.12.3.2.2
Apply the distributive property.
Step 3.12.3.2.3
Apply the distributive property.
Step 3.12.3.3
Simplify and combine like terms.
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Step 3.12.3.3.1
Simplify each term.
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Step 3.12.3.3.1.1
Multiply by .
Step 3.12.3.3.1.2
Multiply by .
Step 3.12.3.3.1.3
Multiply by .
Step 3.12.3.3.1.4
Multiply .
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Step 3.12.3.3.1.4.1
Multiply by .
Step 3.12.3.3.1.4.2
Multiply by .
Step 3.12.3.3.1.4.3
Raise to the power of .
Step 3.12.3.3.1.4.4
Raise to the power of .
Step 3.12.3.3.1.4.5
Use the power rule to combine exponents.
Step 3.12.3.3.1.4.6
Add and .
Step 3.12.3.3.1.5
Rewrite as .
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Step 3.12.3.3.1.5.1
Use to rewrite as .
Step 3.12.3.3.1.5.2
Apply the power rule and multiply exponents, .
Step 3.12.3.3.1.5.3
Combine and .
Step 3.12.3.3.1.5.4
Cancel the common factor of .
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Step 3.12.3.3.1.5.4.1
Cancel the common factor.
Step 3.12.3.3.1.5.4.2
Rewrite the expression.
Step 3.12.3.3.1.5.5
Evaluate the exponent.
Step 3.12.3.3.2
Add and .
Step 3.12.3.3.3
Add and .
Step 3.12.3.4
Apply the distributive property.
Step 3.12.3.5
Multiply by .
Step 3.12.3.6
Multiply by .
Step 3.12.3.7
Simplify each term.
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Step 3.12.3.7.1
Rewrite as .
Step 3.12.3.7.2
Expand using the FOIL Method.
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Step 3.12.3.7.2.1
Apply the distributive property.
Step 3.12.3.7.2.2
Apply the distributive property.
Step 3.12.3.7.2.3
Apply the distributive property.
Step 3.12.3.7.3
Simplify and combine like terms.
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Step 3.12.3.7.3.1
Simplify each term.
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Step 3.12.3.7.3.1.1
Multiply by .
Step 3.12.3.7.3.1.2
Move to the left of .
Step 3.12.3.7.3.1.3
Combine using the product rule for radicals.
Step 3.12.3.7.3.1.4
Multiply by .
Step 3.12.3.7.3.1.5
Rewrite as .
Step 3.12.3.7.3.1.6
Pull terms out from under the radical, assuming positive real numbers.
Step 3.12.3.7.3.2
Add and .
Step 3.12.3.7.3.3
Subtract from .
Step 3.12.3.8
Subtract from .
Step 3.12.3.9
Subtract from .
Step 3.12.3.10
Subtract from .
Step 3.12.3.11
Multiply by .
Step 3.12.3.12
Use the Binomial Theorem.
Step 3.12.3.13
Raise to the power of .
Step 3.12.3.14
Multiply by .
Step 3.12.3.15
Multiply by .
Step 3.12.3.16
Multiply by .
Step 3.12.3.17
Apply the product rule to .
Step 3.12.3.18
Raise to the power of .
Step 3.12.3.19
Multiply by .
Step 3.12.3.20
Rewrite as .
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Step 3.12.3.20.1
Use to rewrite as .
Step 3.12.3.20.2
Apply the power rule and multiply exponents, .
Step 3.12.3.20.3
Combine and .
Step 3.12.3.20.4
Cancel the common factor of .
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Step 3.12.3.20.4.1
Cancel the common factor.
Step 3.12.3.20.4.2
Rewrite the expression.
Step 3.12.3.20.5
Evaluate the exponent.
Step 3.12.3.21
Multiply by .
Step 3.12.3.22
Simplify each term.
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Step 3.12.3.22.1
Raise to the power of .
Step 3.12.3.22.2
Apply the product rule to .
Step 3.12.3.22.3
Raise to the power of .
Step 3.12.3.22.4
Rewrite as .
Step 3.12.3.22.5
Raise to the power of .
Step 3.12.3.22.6
Rewrite as .
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Step 3.12.3.22.6.1
Factor out of .
Step 3.12.3.22.6.2
Rewrite as .
Step 3.12.3.22.7
Pull terms out from under the radical.
Step 3.12.3.22.8
Multiply by .
Step 3.12.3.23
Subtract from .
Step 3.12.3.24
Subtract from .
Step 3.12.3.25
Apply the distributive property.
Step 3.12.3.26
Multiply by .
Step 3.12.3.27
Multiply by .
Step 3.12.3.28
Apply the distributive property.
Step 3.12.3.29
Multiply by .
Step 3.12.3.30
Apply the distributive property.
Step 3.12.3.31
Multiply by .
Step 3.12.3.32
Multiply by .
Step 3.12.3.33
Simplify the numerator.
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Step 3.12.3.33.1
Use the Binomial Theorem.
Step 3.12.3.33.2
Simplify each term.
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Step 3.12.3.33.2.1
Raise to the power of .
Step 3.12.3.33.2.2
Raise to the power of .
Step 3.12.3.33.2.3
Multiply by .
Step 3.12.3.33.2.4
Multiply by .
Step 3.12.3.33.2.5
Rewrite as .
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Step 3.12.3.33.2.5.1
Use to rewrite as .
Step 3.12.3.33.2.5.2
Apply the power rule and multiply exponents, .
Step 3.12.3.33.2.5.3
Combine and .
Step 3.12.3.33.2.5.4
Cancel the common factor of .
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Step 3.12.3.33.2.5.4.1
Cancel the common factor.
Step 3.12.3.33.2.5.4.2
Rewrite the expression.
Step 3.12.3.33.2.5.5
Evaluate the exponent.
Step 3.12.3.33.2.6
Multiply by .
Step 3.12.3.33.2.7
Rewrite as .
Step 3.12.3.33.2.8
Raise to the power of .
Step 3.12.3.33.2.9
Rewrite as .
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Step 3.12.3.33.2.9.1
Factor out of .
Step 3.12.3.33.2.9.2
Rewrite as .
Step 3.12.3.33.2.10
Pull terms out from under the radical.
Step 3.12.3.33.3
Subtract from .
Step 3.12.3.33.4
Add and .
Step 3.12.3.33.5
Add and .
Step 3.12.3.33.6
Add and .
Step 3.12.3.33.7
Subtract from .
Step 3.12.3.33.8
Add and .
Step 3.12.3.33.9
Subtract from .
Step 3.12.3.33.10
Subtract from .
Step 3.12.3.33.11
Subtract from .
Step 3.12.3.33.12
Subtract from .
Step 3.12.3.34
Move the negative in front of the fraction.
Step 3.12.3.35
Multiply .
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Step 3.12.3.35.1
Multiply by .
Step 3.12.3.35.2
Multiply by .
Step 4
The result can be shown in multiple forms.
Exact Form:
Decimal Form:
Step 5