Identify the form: Identify the form of the limit.We need to find the limit of the function (5x+4−3)/(x−1) as x approaches 1. Let's first substitute x with 1 to see if we can directly evaluate the limit.limx→1(5x+4−3)/(x−1)=(5⋅1+4−3)/(1−1)=(9−3)/0=(3−3)/0=0/0We get an indeterminate form 0/0, which means we need to apply a different method to evaluate the limit.
Apply algebraic manipulation: Apply algebraic manipulation to simplify the expression.To resolve the indeterminate form, we can multiply the numerator and the denominator by the conjugate of the numerator. The conjugate of 5x+4−3 is 5x+4+3.limx→1(x−15x+4−3)(5x+4+35x+4+3)
Perform the multiplication: Perform the multiplication in the numerator.When we multiply the conjugate pairs in the numerator, we get a difference of squares, which simplifies to:(5x+4)2−(3)2=(5x+4)−9=5x−5The denominator remains as (x−1)(5x+4+3).limx→1(x−1)(5x+4+3)5x−5
Simplify the expression further: Simplify the expression further.We notice that the numerator 5x−5 can be factored out as 5(x−1). This will allow us to cancel out the (x−1) term in the denominator.limx→1(x−1)(5x+4+3)5(x−1)After canceling out the (x−1) terms, we get:limx→1(5x+4+3)5
Evaluate the limit: Evaluate the limit of the simplified expression.Now that we have simplified the expression, we can directly substitute x with 1 to find the limit.limx→1(5∗1+4+3)5=(9+3)5=(3+3)5=65
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