Key point: a zero of a function is the value that makes the output of the function 0. Graphically, the real zeros of a function are the x-intercepts.
We looked at f(x) = x^2 - 7x - 18 graphically and found the other x-intercept was -2. Which told us f(-2) = 0. Then we noticed that if we factored f(x) = x^2 - 7x - 18, we'd have f(x) = (x + 2)(x - 9). Using the zero product property we could find the zeros by solving x = 2 = 0 or x - 9 = 0.
We completed the first 2 pages of the 4.5 notes.
Use the links for additional practice/help
https://www.khanacademy.org/math/algebra2/polynomial-and-rational/quad_factoring/v/example-1-solving-a-quadratic-equation-by-factoring
https://www.youtube.com/watch?v=SDe-1lGeS0U
http://www.purplemath.com/modules/solvquad.htm
http://www.regentsprep.org/regents/math/algtrig/ate3/quadlesson2.htm
HW: Complete the attached (to your notes) worksheet - do both sides. ALso turn in the 2 person puzzles from last Friday as well as any Circuit Training Worksheets.