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5-3Transforming Parabolas
(Part 2)Big Idea: --Demonstrate and explain what changing a coefficient has on the graph of quadratic functions.
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Vertex and y-intercept of Parabolas
Vertex(1, 2)
y-intercept(0, 5)
y-axis
x-axis
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Ex 1: Identify the vertex and the y-intercept of the graph of each function. A) y = 2.4(x + 10)² B) y =(x – 200)²
+ 1
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C) y = 0.5(x + 5)² - 120
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Vertex Form: y = a(x – h)² + kStandard Form: y = ax2 + bx +c 1. Find the h-value of the vertex by using x =
2. Plug your x-value (h) into quadratic function (original) and find k-value. (vertex (h, k))
3. Find your a-value from y = ax² + bx + c
4. Substitute a, h, and k into vertex form.
a
b
2
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Ex 2: Write each function in vertex form. A) y = 2x² + 10x + 7
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B) y = -3x² + 12x +5
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C) y = -3x² + 12x -1
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Essential Question: How does the second point of graph effect the parabola? Hint: (vertical stretch, vertical shrink, reflection)