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Alg April 2, 2009

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Alg April 2, 2009

1. 1. April 2, 2009 If half of a number is equal to 4 more than twice  the number, what is the number? (A) ­ 3 (B) ­ 8/3 (C) 0 (D) 7/2 (E) 4
2. 2. Approximating Square Root Values 1 2 3 4 5 6 What about negatives? 7 ­1 8 9 10
3. 3. Vertex (max. or min.) c ­ value ­ b x =   2a (axis of symmetry) Plug in x­value to find y x ­ intercepts a ­ value Set y = 0 Solve for x
4. 4. Graphing Overview Look at a­value is it a         or a       ­ b Find vertex x =   2a Plug in x to find y Either: Find 2 points to the right of vertex Or: Find zeros
5. 5. You Hate Factoring? Well, One More Way to Solve 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 y2 = 39y ­ 17 Example:
6. 6. HW:  Practice 10­6 Wksht #2­26 (1/3), 53, 55 ­ Just find a, b, and c; set up word problems Practice 10­3 Wksht #36­51 (1/3)