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.
HW: Complete the factoring decoding puzzle that was started in class. Complete WS 4.4 (both sides) and WS Mountain climbing puzzle (1 - 10; given yesterday). Turn these in tomorrow.
Tomorrow, bring your book to class. Complete page 229 9 - 16.