Answer Key 6.6

[latexpage]

1. \(\begin{array}{ccc}
   \\
   (x)^2&-&(8)^2 \\
   x^2&-&64
   \end{array}\)
2. \(\begin{array}{ccc}
   \\
   (a)^2&-&(4)^2 \\
   a^2&-&16
   \end{array}\)
3. \(\begin{array}{ccc}
   \\
   (1)^2&-&(3p)^2 \\
   1&-&9p^2
   \end{array}\)
4. \(\begin{array}{ccc}
   \\
   (x)^2&-&(3)^2 \\
   x^2&-&9
   \end{array}\)
5. \(\begin{array}{ccc}
   \\
   (1)^2&-&(7n)^2 \\
   1&-&49n^2
   \end{array}\)
6. \(\begin{array}{ccc}
   \\
   (8m)^2&-&(5)^2 \\
   64m^2&-&25
   \end{array}\)
7. \(\begin{array}{ccc}
   \\
   (4y)^2&-&(x)^2 \\
   16y^2&-&x^2
   \end{array}\)
8. \(\begin{array}{ccc}
   \\
   (7a)^2&-&(7b)^2 \\
   49a^2&-&49b^2
   \end{array}\)
9. \(\begin{array}{ccc}
   \\
   (4m)^2&-&(8n)^2 \\
   16m^2&-&64n^2
   \end{array}\)
10. \(\begin{array}{ccc}
    \\
    (3y)^2&-&(3x)^2 \\
    9y^2&-&9x^2
    \end{array}\)
11. \(\begin{array}{ccc}
    \\
    (6x)^2&-&(2y)^2 \\
    36x^2&-&4y^2
    \end{array}\)
12. \(\begin{array}{ccccc}
    \\
    (1)^2&+&2(1)(5n)&+&(5n)^2 \\
    1&+&10n&+&25n^2
    \end{array}\)
13. \(a^2+10a+25\)
14. \(x^2-16x+64\)
15. \(1-12n+36n^2\)
16. \(16x^2-40x+25\)
17. \(25m^2-80m+64\)
18. \(9a^2+18ab+9b^2\)
19. \(25x^2+70xy+49y^2\)
20. \(16m^2-8mn+n^2\)
21. \(25+20r+4r^2\)
22. \(m^2-14m+49\)
23. \(16v^2-49\)
24. \(b^2-16\)