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Name:__________ warm-up 4-1 What determines an equation to be quadratic versus linear? What does a quadratic equation with exponents of 2 usually graph into? What does interpret mean?

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Details of the Day EQ: How do quadratic relations model real-world problems and their solutions? Depending on the situation, why is one method for solving a quadratic equation more beneficial than another? How do transformations help you to graph all functions? Why do we need another number set? I will be able to… Activities: Warm-up Review homework Notes: Graphing Quadratic Functions Chapter 2 test Class work/ HW Vocabulary:. Graph quadratic functions. Find and interpret the maximum and minimum values of a quadratic function. quadratic function quadratic term linear term constant term parabola axis of symmetry vertex maximum value minimum value

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Graphing Quadratics e

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A Quick Review What determines an equation to be quadratic versus linear? What does a quadratic equation with exponents of 2 usually graph into? What does interpret mean?

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Notes and examples Graph f(x) = x 2 + 3x – 1 by making a table of values. xx 2 + 3x – 1y(x,y)

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Notes and examples Graph is the graph of f(x) = 2x 2 + 3x + 2 x2x 2 + 3x + 2y(x,y)

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Notes and examples

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Consider the quadratic function f(x) = 2 – 4x + x 2. Find the y-intercept, the equation of the axis of symmetry, and the x-coordinate of the vertex. Consider the quadratic function f(x) = 2 – 4x + x 2. Use the information from parts A and B to graph the function. Consider the quadratic function f(x) = 2 – 4x + x 2. Make a table of values that includes the vertex. x2 – 4x + x 2 y(x,y)

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Notes and examples

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A. Consider the function f(x) = –x 2 + 2x + 3. Determine whether the function has a maximum or a minimum value C. Consider the function f(x) = –x 2 + 2x + 3. State the domain and range of the function. B. Consider the function f(x) = –x 2 + 2x + 3. State the maximum or minimum value of the function.

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Notes and examples ECONOMICS A souvenir shop sells about 200 coffee mugs each month for $6 each. The shop owner estimates that for each $0.50 increase in the price, he will sell about 10 fewer coffee mugs per month. How much should the owner charge for each mug in order to maximize the monthly income from their sales? Equation I(x)= (200 – 10x) ● (6 + 0.50x) Simplify and Write in Standard form WordsIncome equals number of mugs times price. VariableLet x = the number of $0.50 price increases. Let I(x) equal the income as a function of x. Income is number of mugs times price per mug.

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Notes and examples = –5x 2 + 40x + 1200 I(x) is a quadratic function with a =________ b = ______ c = _______ Since a < 0, the function has a maximum value at the vertex of the graph. Use the formula to find the x-coordinate of the vertex

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Notes and examples Interpretation: This means that the shop should make 4 price increases of $0.50 to maximize their income ECONOMICS A souvenir shop sells about 200 coffee mugs each month for $6 each. The shop owner estimates that for each $0.50 increase in the price, he will sell about 10 fewer coffee mugs per month. What is the maximum monthly income the owner can expect to make from these items? Hint: To determine the maximum income, find the maximum value of the function by evaluating I(x) for x = 4 I(x)=–5x 2 + 40x + 1200

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Notes and examples Check Graph this function on a graphing calculator, and use the CALC menu to confirm this solution. Keystrokes: ENTER2nd [CALC] 4 010 ENTER

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