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lesson26outline

# lesson26outline - MA 153 Lesson 26 Outline Review from last...

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MA 153 Lesson 26 Outline Review from last lesson: Parabolas: 1. Standard Equation : 2 ( ) y a x h k = + Vertex: ( , ) h k 2. Quadratic form: 2 y ax bx c = + + Vertex can be found one of two ways: 1) The x -coordinate of the vertex is 2 b x a = − . Substitute the x- coordinate (once known) into the equation to find the y -coordinate. OR 2) Find the x -intercepts (by factoring). The x- coordinate of the vertex is always in the middle (the midpoint) of the x -intercepts or 1 2 2 x x x + = . Again, substitute the x - coordinate (once known) into the equation to find the y- coordinate For both forms: “a” is the same number and tells you whether the parabola opens up or down. If , then the parabola opens up. 0 a > If , then the parabola opens down. 0 a < The minimum/maximum value = the y -coordinate of the vertex. Answering of homework questions over lesson 24.

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