Math 121, Quiz 3, October 19, 2006
Name:
Instructions. Do all problems, and show appropriate work. Do not use a calculator.
1. Find the equation of the line through the points (−1,2) and (2,−7). Express your answer
in slope-intercept form.
2. For this question fis the quadratic function f(x) = 2x2
−8x+ 3.
(a) Does the graph of y=f(x) open upward or downward?
(b) Does f(x) have a maximum or minimun?
(c) Find the vertex of the parabola y= 2x2
−8x+ 3.
(d) Express the range of the function f(x) in interval notation.
