section 9.4 (link on previous post) problems

• 9
• 10
• 11 (good problem, think about 9.2 investigation, not exactly the same but similar enough)
• 12 (do entire problem.......12d some of the answers will be in radical form, difference of squares, very important)
• 13
• 14 (factor, i.e. turn from plus minus to multiply, then reduce. Include restrictions)