Identify the form: Identify the form of the limit.We need to find the limit of the function as x approaches 2. Let's substitute x=2 into the function to see what form the limit takes.limx→2x−2x4−4x3+4x2=2−224−4⋅23+4⋅22=016−32+16=00This is an indeterminate form, which means we need to do further work to find the limit.
Factor the numerator: Factor the numerator.Since the direct substitution gives us an indeterminate form, we can try to factor the numerator to see if we can simplify the expression.The numerator is a polynomial that seems to be a perfect square trinomial. Let's factor it:x4−4x3+4x2=(x2)2−2⋅2⋅x2⋅x+(2x)2=(x2−2x)2Now we have:limx→2(x−2)(x2−2x)2
Factor out a term: Factor out a term of (x−2) from the numerator.We notice that (x2−2x) can be further factored to x(x−2). This will allow us to cancel out the (x−2) term in the denominator.(x2−2x)2=(x(x−2))2=x2∗(x−2)2Now we have:x→2limx2∗(x−2)2/(x−2)
Cancel the common term: Cancel the common term.We can now cancel the common x−2 term from the numerator and the denominator.limx→2x2∗(x−2)2/(x−2)=limx→2x2∗(x−2)
Evaluate the limit: Evaluate the limit.Now that we have simplified the expression, we can substitute x=2 to find the limit.limx→2x2∗(x−2)=22∗(2−2)=4∗0=0