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MCR3U
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MCR3U Unit 3 – Quadratic Functions Date: 3.8 Linear-‐Quadratic Systems
Homework: Page 198-‐199: Questions #1{a,c}, 2{b,c},4{a,d}, 5, 6, 8, 10, 11, 15, 16 Learning Objectives/Success Criteria: At the end of this lesson I will be able to:
• Describe the number of POIs of a linear function and a quadratic function • Find the POI(s) of a line and a parabola graphically and linearly
Intersection: What is the maximum amount of times a line and a parabola can intersect? To determine the POI(s) algebraically, we want to find the points where f (x) = g(x) . Graph f (x) = −6x2 −3x + 5 g(x) = −6x + 2 Example 1: Jessie had decided to celebrate her birthday by going skydiving. She loves to freefall so she will wait some time before opening her parachute. Her height after jumping from the plane during the freefall can be modeled by the quadratic function h1 = −4.9t
2 + 5500 , where t is the time in seconds, and h(t) is the height above the ground, in metres, t seconds after jumping out. After her releases her parachute, she begins falling at a constant rate. Her height above the ground can be modeled by the linear function h2 = −5t + 4500 . How long after jumping out of the airplane should Jessie release her parachute? Example 2: Determine the number of POI(s) of the quadratic and linear functions:
f (x) = 3x2 +12+14 g(x) = 2x −8
Example 3: Tony tosses Jad out of a window, and Jad’s fall is modeled by the function, h(t) = −5t2 + 20t +15 . Arun shoots at Jad with a paintball gun. The trajectory of the paintball is given by the function g(t) = 3t +3 . Will the paintball hit Jad? If so, when?