Identify Indeterminate Form: Identify the indeterminate form.We need to evaluate the limit of the function (x−3)/(4x+4−4) as x approaches 3. Let's first plug in the value of x=3 to see if the function is defined at that point or if it results in an indeterminate form.limx→34x+4−4x−3=4⋅3+4−43−3=00This is an indeterminate form, so we cannot directly evaluate the limit.
Rationalize Denominator: Rationalize the denominator.To resolve the indeterminate form, we can multiply the numerator and the denominator by the conjugate of the denominator. The conjugate of 4x+4−4 is 4x+4+4.limx→3(4x+4−4)(4x+4+4)(x−3)(4x+4+4)
Apply Difference of Squares: Apply the difference of squares formula.When we multiply the denominator by its conjugate, we get a difference of squares, which simplifies to:(4x+4−4)(4x+4+4)=(4x+4)2−(4)2=4x+4−16=4x−12
Simplify Expression: Simplify the expression.Now we simplify the numerator and the denominator separately:Numerator: (x−3)(4x+4+4)Denominator: 4x−12The limit becomes:limx→34x−12(x−3)(4x+4+4)
Factor Out Common Term: Factor out the common term in the denominator.We notice that the denominator 4x−12 can be factored out as 4(x−3). This will allow us to cancel out the (x−3) term in the numerator and the denominator.limx→34(x−3)(x−3)(4x+4+4)
Cancel Common Terms: Cancel out the common terms.After factoring, we can cancel the (x−3) term in the numerator and the denominator:x→3lim(4x+4+4)/4
Plug in Value: Plug in the value of x=3. Now that we have simplified the expression and eliminated the indeterminate form, we can safely substitute x=3 into the limit: limx→3(4⋅3+4+4)/4=(12+4+4)/4=(16+4)/4=(4+4)/4=8/4=2
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