# discussion 4 37

 Solving Quadratic Equations [CLOs: 1, 2, 4, 5]

My number is 17

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 to complete this discussion. Please complete the following problems according to your assigned number9my number is 17). (Instructors will assign each student their number.)

 If your assigned number is Use FACTORING to solve: Use the QUADRATIC FORMULA to solve: 1 x2 + 9x + 20 = 0 2 on p. 646 2 x2 + 11x + 30 = 0 4 on p. 646 3 6×2 + 7x – 20 = 0 6 on p. 646 4 x2 + 3x + 2 = 0 8 on p. 646 5 x2 + 7x + 12 = 0 10 on p. 646 6 x2 – 9x + 14 = 0 12 on p. 646 7 x2 + 6x – 27 = 0 14 on p. 636 8 x2 – 2x – 24 = 0 16 on p. 636 9 x2 + 3x – 18 = 0 18 on p. 636 10 2×2 + x – 1 = 0 20 on p. 636 11 2×2 – 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 2×2 + 5x – 3 = 0 50 on p. 637 17 3×2 – 10x + 7 = 0 52 on p. 637 18 x3 – 9x = 0 54 on p. 647 19 25x – x3 = 0 3×2 + x – 2 = 0 20 2×2 + 2x – 24 = 0 2×2 – 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 2×2 – x – 3 = 0 10 on p. 658 26 6×2 – 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 4×2 – 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 3×2 – x – 24 = 0 24 on p. 680 38 3×2 – 6x – 24 = 0 26 on p. 680 39 x2 + 9x + 18 = 0 28 on p. 680 40 2×2 – x – 15 = 0 30 on p. 680 41 x2 – 7x + 12 = 0 2×2 – 3x + 1 = 0 42 25×2 – 20x + 4 = 0 16×2 + 1 = 8x 43 x2 + 5x + 6 = 0 3×2 – 10x + 8 = 0 44 x2 – 6x + 5 = 0 3×2 + x – 2 = 0 45 x(x – 5) = 0 2×2 – 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 boldfont to emphasize the words in your writing. Do not write definitions for the words; use them appropriately in sentences describing your math work.