Question

check my answers plz!!!! will give medal

Answer 1

1. [9.01] When the quadratic equation y = (x − 3)(2x + 7) is written in standard form, what is the value of the coefficient "b"? (4 points)
2
−21
−1
1
2. [9.01] Identify which equation is a quadratic equation. (4 points)
y = 3x + 4
y + x2 = (x − 2)(x + 7)
y = −4x(x − 4) + 2x
y + 3 = (x + 12)(x2 + 2)
3. [9.01] Determine whether the graph of y = 2x2 − 5x + 8 opens up or down and whether it has a maximum or minimum point. (4 points)
Down and Maximum
Down and Minimum
Up and Minimum
Up and Maximum
4. [9.01] What is the vertex for the graph of y = −2x2 + 8x − 13? (4 points)
(2, 11)
(2, −5)
(−2, −37)
(−2, −21)
5. [9.01] The graph of which equation is shown below?

(4 points)
y = −x2 + 6x − 5
y = −x2 − 6x − 5
y = x2 + 6x − 5
y = x2 − 6x − 5
6. [9.02] What are the solutions of x2 − 3x − 28 = 0? (4 points)
x = 4, x = 7
x = −4, x = −7
x = 4, x = −7
x = −4, x = 7
7. [9.02] What are the x-intercept(s) of the graph of y − x2 = −8x − 9? (4 points)
(−1, 0) and (9, 0)
(1, 0) and (−9, 0)
(−1, 0) and (−9, 0)
(1, 0) and (9, 0)

Answer 2

Did you solve them?

Answer 3

my answers
1. d
2. c
3. c
4. b
5. b
6. c
7. a

Answer 4

The first 2 are correct. I'd solve the others but I really have to go now. :-S

Answer 5

ok

Answer 6

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