Question

4. [9.01] Determine whether the graph of y = −5x2 + 3x + 8 opens up or down and whether it has a maximum or minimum point. (5 points)
Down; Minimum
Down; Maximum
Up; Minimum
Up; Maximum

Answer 1

6. [9.02] What are the solutions of 6x2 = 12x? (5 points)
x = 0, x = −2
x = 0, x = 2
x = 6, x = 2
x = 6, x = −2
8. [9.02] Solve x2 + 4x − 12 = 0. (5 points)
x = 2, x = −6
x = −2, x = −6
x = 3, x = −4
x = −3, x = 4
9. [9.02] What are the x-intercept(s) of the graph of y + 20 = x2 − x? (5 points)
(−4, 0) and (−5, 0)
(-4, 0) and (5, 0)
(4, 0) and (−5, 0)
(4, 0) and (5, 0)