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A25­2Notes.notebook Algebra 2 Ch.5 Notes Page 17 February 02, 2015 Properties of Parabolas Standard Form: y = ax2 + bx + c f(x) = ax2 + bx + c P17 5­2 Properties of Parabolas a > 0 Opens Up a < 0 Opens Down c = y­intercept (0, c) Line of Symmetry x = ­b 2a Aug 19­6:20 AM Sep 22­9:21 AM Finding a Vertex (Max/Min) Sketching the Parabola y = x2 ­ 2x ­ 3 Up/Down Use Line of Symmetry and Substitution y = 3x2 + 12x + 8 y­Intercept Line of Symm Is Vertex a Max or Min? Oct 8­7:09 AM Vertex Oct 8­7:09 AM 1 A25­2Notes.notebook What if b = 0??? February 02, 2015 HW #17 5­1 P241 #1,5,8,10,11,13,18,20,21,38 5­2 P248 #1,8,10,17,22,23,29,31,37­39,44,54ab Please put your name and class period at the top of the homework. Also include the homework number. Feb 25­10:29 AM Aug 19­6:25 AM Example: Word Problem A company knows that sales can be modeled by ­5p + 100... (where price is p.) What price will maximize revenue? What is the maximum revenue? Revenue is the Product (Mult.) of Price and Sales. r = p(­5p + 100) Find the Vertex Oct 8­8:35 AM 2