pdf files; edits

quarto/precalc/polynomial.qmd

@@ -481,7 +481,7 @@ Now consider the related polynomial, $q$, where we multiply $p$ by $x^n$ and sub
 #| hold: true
 p = a*x^2 + b*x + c
 n = 2    # the degree of p
-q = expand(x^n * p(x => 1/x))
+expand(x^n * p(x => 1/x))
 ```
 
 In particular, from the reversal, the behavior of $q$ for large $x$ depends on the sign of $a_0$. As well, due to the $1/x$, the behaviour of $q$ for large $x>0$ is the same as the behaviour of $p$ for small *positive* $x$. In particular if $a_n > 0$ but $a_0 < 0$, then `p` is eventually positive and `q` is eventually negative.