Solving Quadratics Algebraically
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1 Solving Quadratics Algebraically Table of Contents 1. Introduction to Solving Quadratics. Solving Quadratic Equations using Factoring 3. Solving Quadratic Equations in Context 4. Solving Quadratics using Square Roots 5. Solving Quadratics by Completing the Square 6. Solving Quadratics using the Quadratic Formula Mrs. Daniel Algebra 1 Solving Quadratics: Finding where the parabola intersects the x axis. Also called finding the zeros of the function or the roots of the function because the function s value is zero when x = p and x = q. p q Requires a Calculator! Solving Quadratic Equations with Factoring Solving Equations with Factoring 1. Simplify equation into ax + bx +c = 0. Factor equation. 3. Set each factor equal to zero and solve. 1
2 x 5x +6 = 0 A rectangular porch has dimension of (x + 1) and (x + 5) feet. If the area of the porch floor is 10 square feet, what are the length and the width? The area of a rectangular fountain is (x + 1x + 0) square feet. A foot walkway is built around the fountain. Find the dimensions of the outside border of the walkway. 6x 1x 45 = 0 5x + 30x + 14 = x x + 7x = 15
3 Solving Quadratic Equations in Context Projectile Motion The height of a projectile at a time can be found using the formula h = 16t + vt + s. v = is the initial upwards velocity s = starting height in feet We generally solve for t and/or h. When a baseball player hits a baseball into the air, the height of the ball at t seconds after the ball is hit can be modeled with the projectile motion formula. If the ball is hit at 3 feet off the ground with an upward velocity of 47 feet per second, how long will it take for the ball to hit ground, assuming it is not caught? A child standing on a river bank ten feet above the river throws a rock toward the river at a speed of 1 feet per second. How long does it take before the rock splashed into the river? As a satellite drops from outer space onto Mars, its distance in miles from the planet is given by the formula d = 9t where t is the number of hours it has fallen. Find when the satellite will be 00 miles away from Mars. A volleyball player sets the ball in the air, and the height of the ball after t seconds is given by h = 16t + 1t + 6. A teammate wants to wait until the ball is 8 feet in the air before she spikes it. When (what time) should the teammate spike the ball? How many reasonable solutions are there to this problem? 3
4 An airplane pilot jumps out of an airplane when the plane is 1000 feet above the ground. The jumper has an initial velocity of 60 feet per second downwards. How long does it take to fall from 1000 feet to 900 feet before the parachute opens? Solving Quadratics using Square Roots Square Root 1. Simplify equation. Get x alone.. Take square root of each side. 3. Remember to consider positive and negative solutions. x 8 = 0 4x 5 = (x + 5) = 36 3(x 5) = 7 4
5 A contractor is building a fenced in playground at a daycare. The playground will be rectangular with its width equal to half its length. The total area will be 5000 square feet. Determine how many feet of fencing the contractor will use. Solving Equations by Completing the Square What is Completing the Square? What is Completing the Square? How to (when a = 1): Factor: x 18x Rearrange equation so it is in the form 1x + bx = c. Add ( to both sides of the equation. 3. Factor. 4.Square root each side and solve. 5
6 Solve: a + 0a + 60 = 0 Solve: x + 6x 3 = 0 Solve: x + x 5 = x How to (when a 1): 1. Rearrange equation so it is in the form ax + bx = c. a needs to be a perfect square. (For example, 4, 9, 16, etc). If not, multiple entire equation to make a a perfect square. 3. Add to both sides of the equation. 4. Factor. 5.Square root each side and solve. Solve: 9x + 1x = 3 Solve: x 6x = 5 6
7 A person kicks a soccer ball from the ground with an initial upward velocity of 16 feet per second. What is the maximum height of the soccer ball? When will the soccer ball hit the ground? Solving Quadratics using the Quadratic Formula The Quadratic Formula x b b 4ac a Solve: x x Identify a, b and c.. Plug in. 3. Simplify under radical. 4. Separate positive and negative solutions. 5. Solve. Solve: x x x 5 9 Solve using the Quadratic Equation. 1. x + 5x + 3 = 0 7
8 Solve using the Quadratic Equation.. 5x + 16x 84 = 0 The Discriminant You can use the discriminant to determine the number and type of solutions to the equation. Find the discriminant and give the number of solutions of the equation. a) x 6x 10 0 b 4ac b) x 6x 9 0 c) x 6x 8 0 Use the Discriminant to determine # of solutions; verify in context A diver jumps from a platform 10 meters above the surface of the water. The diver s height is given by the equation h = 4.9t + 3.5t + 10 where t is the time in seconds after the diver jumps. For what time t is the diver s height 1 meter? Use the Discriminant to determine # of solutions; verify in context The height in meters of a model rocket on a particular launch can be modeled by the equation h = 4.9t + 10t + 100, where t is the time in seconds after its engine burns out 100 meters above the ground. When will the rocket reach a height of 600 meters? 8
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