Notes 9.2 ­ Quadratics in proportions (in progress).notebook
January 10, 2013
Bellwork
1. Simplify the following ratio.
48 hours
3 weeks
2. The angles of a triangle are in the extended ratio of 2:3:4. Find the measures of the angles.
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
Assignment 9.1
11. 6/1
13. 2/3
15. 3/4
17. 3/1
19. 7/20
21. 9/5
23. 4/5
25. 2/3
27. 11/9
29. 30ft, 12ft
31. 15o, 60o, 105o
33. 20/7
35. 35/2
37. 7/3
39. 12
January 10, 2013
Pg 461­464 11­47 odd, 57, 58, 63, 65, 66, 73
41. 15
43. ­48/5
45. 16
47. 21
57. RQ = 12 PQ = 13 SU = 15 ST = 39
58. PR = 3 RQ = √91 ST = 30 UT = 3√91
63. EF = 20 DF = 24
65. D
66. D
73. (­1.5, 3) and (1, 3)
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
Notes 9.2 ­ Quadratics in Proportions
Remember...
Standard Form of a Quadratic Equation:
ax2 + bx + c = 0
2 Ways to Solve Quadratics:
1. Factoring
2. Quadratic Formula
January 10, 2013
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
ABC Factoring Reminder
2x2 ­ 15x + 7
January 10, 2013
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
Ex. 1: January 10, 2013
Steps to Solve:
1. Cross multiply
2. Simplify both sides
3. Get = 0
4. Factor
5. Solve
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
Ex. 2: January 10, 2013
Ex. 3: Notes 9.2 ­ Quadratics in proportions (in progress).notebook
January 10, 2013
Get out a blank piece of paper, please!!!
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
What if it doesn't factor???
2 ­ 4ac
­ b
b
x = ±√2a
January 10, 2013
Notes 9.2 ­ Quadratics in proportions (in progress).notebook
Ex. 4: January 10, 2013
Ex. 5: