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2/15/10 (Monday) NOTES CLASSWORK HOMEWORK No School President’s Day No Homework NOTES CLASSWORK HOMEWORK Quadratic Equation An equation that can be written in the form of ax 2 bx c 0 , where a, b, and c are real numbers and a 0, is a quadratic equation. Common Assessment HW#29 Quadratic Equations CW S.N PH p. 578 #1-6 Write each equation in standard from and determine a, b, and c. 1) x 2 3x 2 0 2) x 2 8 x 5 0 3) 2 x 2 3 4) 5 x 2 9 5) 7 x 2 4 x 3 6) 9 x 2 x 5 TB p. 463 #39-42 2/16/10 (Tuesday) Standard Form ax 2 bx c 0 Simplifying Radicals Factor each number under the radical sign and find the square root of a perfect square and bring that number outside. Keep the remaining factors under the radical sign. Finding Square Root and Simplifying. Simplify. (Factor each number under the radical sign and find the square root of a perfect square and bring that number outside. Keep the non-perfect square factor under the radical sign.) 1) 2) 3) 4) 5) 49 50 60 80 18 2/17/10 (Wednesday) NOTES CLASSWORK HOMEWORK Quadratic Formula Quadratic Equations HW#30 If ax 2 bx c 0 , a 0, then CW S.N PH p. 593 #1-5 Solve using the quadratic formula. (Be sure to write down the quadratic formula every time you use it.) 1) x 2 4 x 21 2) x 2 7 x 18 3) x 2 6 x 9 4) x 2 8 x 16 5) 3 y 2 2 y 8 0 TB p. 438 #24-27 Factor each polynomial and set each factor equal to zero. Then, solve for each variable. x b b 2 4ac 2a gives the solutions of the quadratic equation. Solutions of the quadratic equations are called zeroes, xintercepts, or roots. 2/18/10 (Thursday) NOTES CLASSWORK HOMEWORK More on Quadratics HW#31 CW S.N PH p. 593 #10-15 Solve using the quadratic formula. 10) x 2 4 0 11) x 2 2 x 1 0 12) x 2 4 x 7 0 13) y 2 10 y 22 0 TB p.497 #1-4 You do not need to round your answer to the nearest tenth. You may keep your solution as a radical form. (square root of some number) The graph of a quadratic equation ax 2 bx c 0 is called a parabola (U-shaped graph) - Opens upward when a is positive Opens downward when a is negative The solutions of the quadratic equation are the x-intercepts of the graph. 14) y 2 6 y 9 0 15) x 2 4 x 4 7 2/19/10 (Friday) NOTES CLASSWORK HOMEWORK Periodic Assessment HW#32 Turn in Classwork. TB p. 497 #9-12 You do not need to round your answer to the nearest tenth. You may keep your solution as a radical form. (square root of some number) Turn in February Calendar for homework grades. Be sure to get it back.