Answer Key 6.6

$\begin{array}{ccc} \\ (x)^2&-&(8)^2 \\ x^2&-&64 \end{array}$
$\begin{array}{ccc} \\ (a)^2&-&(4)^2 \\ a^2&-&16 \end{array}$
$\begin{array}{ccc} \\ (1)^2&-&(3p)^2 \\ 1&-&9p^2 \end{array}$
$\begin{array}{ccc} \\ (x)^2&-&(3)^2 \\ x^2&-&9 \end{array}$
$\begin{array}{ccc} \\ (1)^2&-&(7n)^2 \\ 1&-&49n^2 \end{array}$
$\begin{array}{ccc} \\ (8m)^2&-&(5)^2 \\ 64m^2&-&25 \end{array}$
$\begin{array}{ccc} \\ (4y)^2&-&(x)^2 \\ 16y^2&-&x^2 \end{array}$
$\begin{array}{ccc} \\ (7a)^2&-&(7b)^2 \\ 49a^2&-&49b^2 \end{array}$
$\begin{array}{ccc} \\ (4m)^2&-&(8n)^2 \\ 16m^2&-&64n^2 \end{array}$
$\begin{array}{ccc} \\ (3y)^2&-&(3x)^2 \\ 9y^2&-&9x^2 \end{array}$
$\begin{array}{ccc} \\ (6x)^2&-&(2y)^2 \\ 36x^2&-&4y^2 \end{array}$
$\begin{array}{ccccc} \\ (1)^2&+&2(1)(5n)&+&(5n)^2 \\ 1&+&10n&+&25n^2 \end{array}$
$a^2+10a+25$
$x^2-16x+64$
$1-12n+36n^2$
$16x^2-40x+25$
$25m^2-80m+64$
$9a^2+18ab+9b^2$
$25x^2+70xy+49y^2$
$16m^2-8mn+n^2$
$25+20r+4r^2$
$m^2-14m+49$
$16v^2-49$
$b^2-16$

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