Calculus Examples

Evaluate the Limit ( limit as x approaches 4 of x-4)/(x^2-3x-4)
Step 1
Evaluate the limit.
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Step 1.1
Split the limit using the Sum of Limits Rule on the limit as approaches .
Step 1.2
Evaluate the limit of which is constant as approaches .
Step 2
Evaluate the limit of by plugging in for .
Step 3
Simplify the answer.
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Step 3.1
Simplify the numerator.
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Step 3.1.1
Multiply by .
Step 3.1.2
Subtract from .
Step 3.2
Factor using the AC method.
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Step 3.2.1
Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .
Step 3.2.2
Write the factored form using these integers.
Step 3.3
Divide by .