Calculus Examples

Evaluate the Limit limit as x approaches infinity of ((4+5x)(2-x))/((2+x)(1-x))
Step 1
Apply L'Hospital's rule.
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Step 1.1
Evaluate the limit of the numerator and the limit of the denominator.
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Step 1.1.1
Take the limit of the numerator and the limit of the denominator.
Step 1.1.2
Evaluate the limit of the numerator.
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Step 1.1.2.1
Apply the distributive property.
Step 1.1.2.2
Apply the distributive property.
Step 1.1.2.3
Apply the distributive property.
Step 1.1.2.4
Simplify the expression.
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Step 1.1.2.4.1
Move .
Step 1.1.2.4.2
Move .
Step 1.1.2.4.3
Multiply by .
Step 1.1.2.4.4
Multiply by .
Step 1.1.2.4.5
Multiply by .
Step 1.1.2.4.6
Multiply by .
Step 1.1.2.5
Raise to the power of .
Step 1.1.2.6
Raise to the power of .
Step 1.1.2.7
Use the power rule to combine exponents.
Step 1.1.2.8
Simplify by adding terms.
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Step 1.1.2.8.1
Add and .
Step 1.1.2.8.2
Add and .
Step 1.1.2.8.3
Simplify the expression.
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Step 1.1.2.8.3.1
Reorder and .
Step 1.1.2.8.3.2
Move .
Step 1.1.2.9
The limit at infinity of a polynomial whose leading coefficient is negative is negative infinity.
Step 1.1.3
Evaluate the limit of the denominator.
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Step 1.1.3.1
Apply the distributive property.
Step 1.1.3.2
Apply the distributive property.
Step 1.1.3.3
Apply the distributive property.
Step 1.1.3.4
Simplify the expression.
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Step 1.1.3.4.1
Reorder and .
Step 1.1.3.4.2
Reorder and .
Step 1.1.3.4.3
Multiply by .
Step 1.1.3.4.4
Multiply by .
Step 1.1.3.4.5
Multiply by .
Step 1.1.3.5
Factor out negative.
Step 1.1.3.6
Raise to the power of .
Step 1.1.3.7
Raise to the power of .
Step 1.1.3.8
Use the power rule to combine exponents.
Step 1.1.3.9
Simplify by adding terms.
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Step 1.1.3.9.1
Add and .
Step 1.1.3.9.2
Add and .
Step 1.1.3.9.3
Simplify the expression.
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Step 1.1.3.9.3.1
Reorder and .
Step 1.1.3.9.3.2
Move .
Step 1.1.3.10
The limit at infinity of a polynomial whose leading coefficient is negative is negative infinity.
Step 1.1.3.11
Infinity divided by infinity is undefined.
Undefined
Step 1.1.4
Infinity divided by infinity is undefined.
Undefined
Step 1.2
Since is of indeterminate form, apply L'Hospital's Rule. L'Hospital's Rule states that the limit of a quotient of functions is equal to the limit of the quotient of their derivatives.
Step 1.3
Find the derivative of the numerator and denominator.
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Step 1.3.1
Differentiate the numerator and denominator.
Step 1.3.2
Differentiate using the Product Rule which states that is where and .
Step 1.3.3
By the Sum Rule, the derivative of with respect to is .
Step 1.3.4
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.5
Add and .
Step 1.3.6
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.7
Differentiate using the Power Rule which states that is where .
Step 1.3.8
Multiply by .
Step 1.3.9
Move to the left of .
Step 1.3.10
Rewrite as .
Step 1.3.11
By the Sum Rule, the derivative of with respect to is .
Step 1.3.12
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.13
Add and .
Step 1.3.14
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.15
Move to the left of .
Step 1.3.16
Differentiate using the Power Rule which states that is where .
Step 1.3.17
Multiply by .
Step 1.3.18
Simplify.
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Step 1.3.18.1
Apply the distributive property.
Step 1.3.18.2
Apply the distributive property.
Step 1.3.18.3
Combine terms.
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Step 1.3.18.3.1
Multiply by .
Step 1.3.18.3.2
Multiply by .
Step 1.3.18.3.3
Multiply by .
Step 1.3.18.3.4
Multiply by .
Step 1.3.18.3.5
Add and .
Step 1.3.18.3.6
Subtract from .
Step 1.3.19
Differentiate using the Product Rule which states that is where and .
Step 1.3.20
By the Sum Rule, the derivative of with respect to is .
Step 1.3.21
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.22
Add and .
Step 1.3.23
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.24
Differentiate using the Power Rule which states that is where .
Step 1.3.25
Multiply by .
Step 1.3.26
Move to the left of .
Step 1.3.27
Rewrite as .
Step 1.3.28
By the Sum Rule, the derivative of with respect to is .
Step 1.3.29
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.30
Add and .
Step 1.3.31
Differentiate using the Power Rule which states that is where .
Step 1.3.32
Multiply by .
Step 1.3.33
Simplify.
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Step 1.3.33.1
Apply the distributive property.
Step 1.3.33.2
Combine terms.
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Step 1.3.33.2.1
Multiply by .
Step 1.3.33.2.2
Add and .
Step 1.3.33.2.3
Subtract from .
Step 2
Divide the numerator and denominator by the highest power of in the denominator, which is .
Step 3
Evaluate the limit.
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Step 3.1
Cancel the common factor of .
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Step 3.1.1
Cancel the common factor.
Step 3.1.2
Divide by .
Step 3.2
Cancel the common factor of .
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Step 3.2.1
Cancel the common factor.
Step 3.2.2
Divide by .
Step 3.3
Split the limit using the Limits Quotient Rule on the limit as approaches .
Step 3.4
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 3.5
Evaluate the limit of which is constant as approaches .
Step 3.6
Move the term outside of the limit because it is constant with respect to .
Step 4
Since its numerator approaches a real number while its denominator is unbounded, the fraction approaches .
Step 5
Evaluate the limit.
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Step 5.1
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 5.2
Evaluate the limit of which is constant as approaches .
Step 6
Since its numerator approaches a real number while its denominator is unbounded, the fraction approaches .
Step 7
Simplify the answer.
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Step 7.1
Cancel the common factor of and .
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Step 7.1.1
Rewrite as .
Step 7.1.2
Factor out of .
Step 7.1.3
Factor out of .
Step 7.1.4
Factor out of .
Step 7.1.5
Factor out of .
Step 7.1.6
Factor out of .
Step 7.1.7
Cancel the common factors.
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Step 7.1.7.1
Factor out of .
Step 7.1.7.2
Cancel the common factor.
Step 7.1.7.3
Rewrite the expression.
Step 7.2
Simplify the numerator.
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Step 7.2.1
Multiply by .
Step 7.2.2
Add and .
Step 7.3
Add and .
Step 7.4
Multiply by .
Step 7.5
Divide by .