1. Express the function in the form f(x) = a(x-h)2 + K and indicate the vertex.
a. f(x) = -x^2 + 13x - 8
b. f(x) = 4x^2 - 8x + 1
2. An object is thrown upward from the top of a 160-foot (Ho) building with an initial velocity (Vo) of 48 feet per second. How long after the object is projected upward will it strike the ground?
3. The profit that a vendor makes per day by selling X pretzels is given by the function P(x) = -0.004x^2 + 2.8x - 350. Find the number of pretzels that must be sold to maximize profit.
Functions are maximized and a vertex is found.