Week 4: Discussion 1

Week 4 - Discussion

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Your initial discussion thread is due on Day 3 (Thursday) and you have until Day 7 (Monday) to respond to your classmates. Your grade will reflect both the quality of your initial post and the depth of your responses. Refer to the Discussion Forum Grading Rubric under the Settings icon above for guidance on how your discussion will be evaluated.

Solving Quadratic Equations

In this discussion, you will solve quadratic equations by two main methods: factoring and using the quadratic formula. Read the following instructions in order and view the example to complete this discussion. Please complete the following problems according to your assigned number. (Instructors will assign each student their number.)

If your assigned number is	Use FACTORING to solve:	Use the QUADRATIC FORMULA to solve:
	x2 + 9x + 20 = 0	2 on p. 646
	x2 + 11x + 30 = 0	4 on p. 646
	6x2 + 7x – 20 = 0	6 on p. 646
	x2 + 3x + 2 = 0	8 on p. 646
	x2 + 7x + 12 = 0	10 on p. 646
	x2 – 9x + 14 = 0	12 on p. 646
	x2 + 6x – 27 = 0	14 on p. 636
	x2 – 2x – 24 = 0	16 on p. 636
	x2 + 3x – 18 = 0	18 on p. 636
10	2x2 + x – 1 = 0	20 on p. 636
11	2x2 – x – 3 = 0	22 on p. 637
12	x2 – x = 0	24 on p. 637
13	x2 + x – 42 = 0	44 on p. 637
14	x2 + x – 20 = 0	46 on p. 636
15	x2 + 5x = 0	48 on p. 637
16	2x2 + 5x – 3 = 0	50 on p. 637
17	3x2 – 10x + 7 = 0	52 on p. 637
18	x3 – 9x = 0	54 on p. 647
19	25x – x3 = 0	3x2 + x - 2 = 0
20	2x2 + 2x – 24 = 0	2x2 - 7x + 5 = 0
21	x2 – x – 6 = 0	2 on p. 658
22	x2 + 6x + 8 = 0	4 on p. 658
23	x2 + 2x – 15 = 0	6 on p. 658
24	x2 – 2x – 15 = 0	8 on p. 658
25	2x2 – x – 3 = 0	10 on p. 658
26	6x2 – x – 15 = 0	2 on p. 680
27	x2 + 14x + 49 = 0	4 on p. 680
28	x2 – 6x + 9 = 0	6 on p. 680
29	x2 – 16 = 0	8 on p. 680
30	4x2 – 25 = 0	10 on p. 680
31	x2 + 10x + 21 = 0	12 on p. 680
32	x2 – 6x – 7 = 0	14 on p. 680
33	x2 + x – 2 = 0	16 on p. 680
34	x2 – 4x – 12 = 0	18 on p. 680
35	x2 –10x + 25 = 0	20 on p. 680
36	x2 + 6x + 5 = 0	22 on p. 680
37	3x2 – x – 24 = 0	24 on p. 680
38	3x2 – 6x – 24 = 0	26 on p. 680
39	x2 + 9x + 18 = 0	28 on p. 680
40	2x2 – x – 15 = 0	30 on p. 680
41	x2 – 7x + 12 = 0	2x2 – 3x + 1 = 0
42	25x2 – 20x + 4 = 0	16x2 + 1 = 8x
43	x2 + 5x + 6 = 0	3x2 – 10x + 8 = 0
44	x2 – 6x + 5 = 0	3x2 + x – 2 = 0
45	x(x – 5) = 0	2x2 – 7x + 5 = 0

For the factoring problem, be sure you show all steps to the factoring and solving. Show a check of your solutions back into the original equation.

For the quadratic formula problem, be sure that you use readable notation while you are working the computational steps. Refer to the Inserting Math Symbols handout for guidance with formatting.

Present your final solutions as decimal approximations carried out to the third decimal place. Due to the nature of these solutions, no check is required.

Incorporate the following four math vocabulary words into your discussion. Use bold font to emphasize the words in your writing. Do not write definitions for the words; use them appropriately in sentences describing your math work.
- Quadratic formula
- Factoring
- Completing the square
- Discriminant

Your initial post should be at least 250 words in length. Support your claims with examples from required material(s) and/or other scholarly resources, and properly cite any references. Respond to at least two of your classmates’ posts by Day 7.