Answer Key 6.6

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

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