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# Alg April 7, 2009

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### Alg April 7, 2009

1. 1. April 7, 2009 2 If  f (x) = x  + 4,   g(x) = 5x + 2, and   h(x) =  f (x) + g(x),  for which of the  following values is h(x) = 0 ? (A) ­3 h(x) = x2 + 4 + 5x + 2 (B) 0 h(x) = x2 + 5x + 6 (C) 2      0 = x2 + 5x + 6 (D) 3      0 = (x + 2)(x + 3) (E) 5
2. 2. The Fail­Safe To Solving Quadratics! ­ b ± √b2 ­ 4ac Quadratic Formula: x = 2a ­ Can be used for ANY quadratic equation ­ Quadratic must be in the form: 0 = ax2 + bx + c
3. 3. Practice 10­6 Wksht #2­26 (1/3) x2 ­ 36 = 0 a = 1, b = 0, c = ­36 #2: ­ (0) ± √(0)2 ­ 4(1)(­36) ­ b ± √b2 ­ 4ac x = x = 2(1) 2a 0 ± √144 x = 2 0 ± 12 x = 2 12  ,  ­12 x = 2 2 x = 6, ­6
4. 4. Practice 10­6 Wksht #2­26 (1/3) #5: 4p2 ­ 12p ­ 91 = 0 a = 4, b = ­12, c = ­91 ­ b ± √b2 ­ 4ac ­ (­12) ± √(­12)2 ­ 4(4)(­91) x = x = 2a 2(4)
5. 5. To Do Now (w/ Partner): #1, 4, 10 10­6 Wksht
6. 6. HW: Practice 10­6 Wksht #3­39 (1/6) Chapter Test on Thursday!