Calculus Examples

Evaluate the Limit limit as x approaches 3 of (x^2-x-6)/(4- square root of 5x+1)
Step 1
Apply L'Hospital's rule.
Tap for more steps...
Step 1.1
Evaluate the limit of the numerator and the limit of the denominator.
Tap for more steps...
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.
Tap for more steps...
Step 1.1.2.1
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 1.1.2.2
Move the exponent from outside the limit using the Limits Power Rule.
Step 1.1.2.3
Evaluate the limit of which is constant as approaches .
Step 1.1.2.4
Evaluate the limits by plugging in for all occurrences of .
Tap for more steps...
Step 1.1.2.4.1
Evaluate the limit of by plugging in for .
Step 1.1.2.4.2
Evaluate the limit of by plugging in for .
Step 1.1.2.5
Simplify the answer.
Tap for more steps...
Step 1.1.2.5.1
Simplify each term.
Tap for more steps...
Step 1.1.2.5.1.1
Raise to the power of .
Step 1.1.2.5.1.2
Multiply by .
Step 1.1.2.5.2
Subtract from .
Step 1.1.2.5.3
Subtract from .
Step 1.1.3
Evaluate the limit of the denominator.
Tap for more steps...
Step 1.1.3.1
Evaluate the limit.
Tap for more steps...
Step 1.1.3.1.1
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 1.1.3.1.2
Evaluate the limit of which is constant as approaches .
Step 1.1.3.1.3
Move the limit under the radical sign.
Step 1.1.3.1.4
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 1.1.3.1.5
Move the term outside of the limit because it is constant with respect to .
Step 1.1.3.1.6
Evaluate the limit of which is constant as approaches .
Step 1.1.3.2
Evaluate the limit of by plugging in for .
Step 1.1.3.3
Simplify the answer.
Tap for more steps...
Step 1.1.3.3.1
Simplify each term.
Tap for more steps...
Step 1.1.3.3.1.1
Multiply by .
Step 1.1.3.3.1.2
Add and .
Step 1.1.3.3.1.3
Rewrite as .
Step 1.1.3.3.1.4
Pull terms out from under the radical, assuming positive real numbers.
Step 1.1.3.3.1.5
Multiply by .
Step 1.1.3.3.2
Subtract from .
Step 1.1.3.3.3
The expression contains a division by . The expression is undefined.
Undefined
Step 1.1.3.4
The expression contains a division by . The expression is undefined.
Undefined
Step 1.1.4
The expression contains a division by . The expression 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.
Tap for more steps...
Step 1.3.1
Differentiate the numerator and denominator.
Step 1.3.2
By the Sum Rule, the derivative of with respect to is .
Step 1.3.3
Differentiate using the Power Rule which states that is where .
Step 1.3.4
Evaluate .
Tap for more steps...
Step 1.3.4.1
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.4.2
Differentiate using the Power Rule which states that is where .
Step 1.3.4.3
Multiply by .
Step 1.3.5
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.6
Add and .
Step 1.3.7
By the Sum Rule, the derivative of with respect to is .
Step 1.3.8
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.9
Evaluate .
Tap for more steps...
Step 1.3.9.1
Use to rewrite as .
Step 1.3.9.2
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.9.3
Differentiate using the chain rule, which states that is where and .
Tap for more steps...
Step 1.3.9.3.1
To apply the Chain Rule, set as .
Step 1.3.9.3.2
Differentiate using the Power Rule which states that is where .
Step 1.3.9.3.3
Replace all occurrences of with .
Step 1.3.9.4
By the Sum Rule, the derivative of with respect to is .
Step 1.3.9.5
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.9.6
Differentiate using the Power Rule which states that is where .
Step 1.3.9.7
Since is constant with respect to , the derivative of with respect to is .
Step 1.3.9.8
To write as a fraction with a common denominator, multiply by .
Step 1.3.9.9
Combine and .
Step 1.3.9.10
Combine the numerators over the common denominator.
Step 1.3.9.11
Simplify the numerator.
Tap for more steps...
Step 1.3.9.11.1
Multiply by .
Step 1.3.9.11.2
Subtract from .
Step 1.3.9.12
Move the negative in front of the fraction.
Step 1.3.9.13
Multiply by .
Step 1.3.9.14
Add and .
Step 1.3.9.15
Combine and .
Step 1.3.9.16
Combine and .
Step 1.3.9.17
Move to the left of .
Step 1.3.9.18
Move to the denominator using the negative exponent rule .
Step 1.3.10
Subtract from .
Step 1.4
Multiply the numerator by the reciprocal of the denominator.
Step 1.5
Rewrite as .
Step 2
Evaluate the limit.
Tap for more steps...
Step 2.1
Move the term outside of the limit because it is constant with respect to .
Step 2.2
Split the limit using the Product of Limits Rule on the limit as approaches .
Step 2.3
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 2.4
Move the term outside of the limit because it is constant with respect to .
Step 2.5
Evaluate the limit of which is constant as approaches .
Step 2.6
Move the term outside of the limit because it is constant with respect to .
Step 2.7
Move the limit under the radical sign.
Step 2.8
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 2.9
Move the term outside of the limit because it is constant with respect to .
Step 2.10
Evaluate the limit of which is constant as approaches .
Step 3
Evaluate the limits by plugging in for all occurrences of .
Tap for more steps...
Step 3.1
Evaluate the limit of by plugging in for .
Step 3.2
Evaluate the limit of by plugging in for .
Step 4
Simplify the answer.
Tap for more steps...
Step 4.1
Simplify each term.
Tap for more steps...
Step 4.1.1
Multiply by .
Step 4.1.2
Multiply by .
Step 4.2
Subtract from .
Step 4.3
Cancel the common factor of .
Tap for more steps...
Step 4.3.1
Factor out of .
Step 4.3.2
Cancel the common factor.
Step 4.3.3
Rewrite the expression.
Step 4.4
Multiply by .
Step 4.5
Multiply by .
Step 4.6
Add and .
Step 4.7
Rewrite as .
Step 4.8
Pull terms out from under the radical, assuming positive real numbers.
Step 4.9
Multiply by .