Answer Key 7.5

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1. \((r-4)(r+4)\)
2. \((x-3)(x+3)\)
3. \((v-5)(v+5)\)
4. \((x-1)(x+1)\)
5. \((p-2)(p+2)\)
6. \((2v-1)(2v+1)\)
7. \(3(x^2-9)\)
   \(3(x-3)(x+3)\)
8. \(5(n^2-4)\)
   \(5(n-2)(n+2)\)
9. \(4(4x^2-9)\)
   \(4(2x-3)(2x+3)\)
10. \(5(25x^2+9y^2)\)
11. \((a-1)^2\)
12. \((k+2)^2\)
13. \((x+3)^2\)
14. \((n-4)^2\)
15. \((5p-1)^2\)
16. \((x+1)^2\)
17. \((5a+3b)^2\)
18. \((x+4y)^2\)
19. \(2(4x^2-12xy+9y^2)\)
    \(2(2x-3y)^2\)
20. \(5(4x^2+4xy+y^2)\)
    \(5(2x+y)^2\)
21. \((2-m)(4+2m+m^2)\)
22. \((x+4)(x^2-4x+16)\)
23. \((x-4)(x^2+4x+16)\)
24. \((x+2)(x^2-2x+4)\)
25. \((6-u)(36+6u+u^2)\)
26. \((5x-6)(25x^2+30x+36)\)
27. \((5a-4)(25a^2+20a+16)\)
28. \((4x-3)(16x^2+12x+9)\)
29. \((4x+3y)(16x^2-12xy+9y^2)\)
30. \(4(8m^3-27n^3)\)
    \(4(2m-3n)(4m^2+6mn+9n^2)\)