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Unit 2 – Quadratic, Polynomial, and Radical Equations and
InequalitiesChapter 5 – Quadratic Functions and Inequalities5.2 – Solving Quadratic Equations by Graphing
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5.2 – Solving Quadratic Equations by Graphing
Quadratic equation – when a quadratic function is set to a valueax2 + bx + c = 0, where a ≠ 0
Standard form – where a, b, and c are integers
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5.2 – Solving Quadratic Equations by Graphing
Roots – solutions of a quadratic equation
One method for finding roots is to find the zeros of the function
Zeros – the x-intercepts of its graphThey are solutions because f(x) = 0 at those points
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5.2 – Solving Quadratic Equations by Graphing
Example 1 Solve x2 – 3x – 4 = 0 by
graphing.
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5.2 – Solving Quadratic Equations by Graphing
A quadratic equation can have one real solution, two real solutions, or no real solution.
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5.2 – Solving Quadratic Equations by Graphing
Example 2 Solve x2 – 4x = -4 by
graphing.
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5.2 – Solving Quadratic Equations by Graphing
Example 3 Find two real numbers
with a sum of 4 and a product of 5, or show that no such numbers exist.
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5.2 – Solving Quadratic Equations by Graphing
Often exact roots cannot be found by graphing
We can estimate solutions by stating the integers between which the roots are located.
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5.2 – Solving Quadratic Equations by Graphing
Example 4 Solve x2 – 6x + 3 = 0 by
graphing. If exact roots cannot be found, state the consecutive integers between which the roots are located.
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5.2 – Solving Quadratic Equations by Graphing
Example 5 The highest bridge in the
U.S. is the Royal Gorge Bridge in Colorado. The deck is 1053 feet above the river. Suppose a marble is dropped over the railing from a height of 3 feet above the bridge deck. How long will it take the marble to reach the surface of the water, assuming there is no air resistance? Use the formula h(t) = -16t2 + h0, where t is time in seconds and h0 is the initial height above the water in feet.
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5.2 – Solving Quadratic Equations by Graphing
Example 5 (cont.)
The highest bridge in the U.S. is the Royal Gorge Bridge in Colorado. The deck is 1053 feet above the river. Suppose a marble is dropped over the railing from a height of 3 feet above the bridge deck. How long will it take the marble to reach the surface of the water, assuming there is no air resistance? Use the formula h(t) = -16t2 + h0, where t is time in seconds and h0 is the initial height above the water in feet.
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5.2 – Solving Quadratic Equations by Graphing
HOMEWORK
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#15 – 29 odd, 30 – 31, 44 – 45