Identify Form of Limit: Identify the form of the limit.We need to find the limit of the function (x−3)(x+4)/(x+5) as x approaches −5. Let's substitute x with −5 to see if the function is defined at that point.limx→−5(x+5)(x−3)(x+4)=(−5+5)(−5−3)(−5+4)
Check for Indeterminate Forms: Perform the substitution to check for indeterminate forms.Substituting −5 into the function gives us:(−5+5)(−5−3)(−5+4)=0(−8)(−1)This results in a division by zero, which is undefined. However, since we are dealing with a limit, we need to check if the function approaches a specific value as x approaches −5.
Simplify Expression: Simplify the expression to see if the limit can be determined.Since the denominator becomes 0 when x=−5, we have an indeterminate form of the type 0/0. This means we can apply algebraic manipulation to simplify the expression and possibly eliminate the indeterminate form.
Factor Out Common Factor: Factor out the common factor in the numerator and denominator.Notice that the numerator (x−3)(x+4) can be rewritten as (x+5−8)(x+4), and we can see that (x+5) is a common factor in the numerator and denominator. However, since we are not actually factoring out (x+5) from the numerator, we realize that there is no common factor to cancel out with the denominator. This means we cannot simplify the expression by canceling out the (x+5) term.