Question
, find the indicated limit. In most cases, it will be wise to do some algebra first.$$\lim _{x \rightarrow 3} \frac{x^{4}-18 x^{2}+81}{(x-3)^{2}}$$
Step 1
We can do this by performing long division on the numerator and the denominator. The denominator expands to $x^{2}-6x+9$. We can rewrite the numerator as $x^{4}+0x^{3}-18x^{2}+0x+81$. Show more…
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