Quadratic Graphs And Equations
- 1.Solve. 8x2 + 10x + 3 = 0
- A.
X = -8 and -4
- B.
X = -2 and -6
- C.
X = -1.5 and -0.167
- D.
X = -0.75 and -0.5
- 2.Use the discriminant to find the number of real solutions. 2x2 + 5x + 7 = 0
- A.
0
- B.
1
- C.
2
- 3.Solve. 1x2 + 12x + 32 = 0
- A.
X = -8 and -4
- B.
X = -2 and -6
- C.
X = -1.5 and -0.167
- D.
X = -0.75 and -0.5
- 4.Solve. 16x2 + 20x = 0
- A.
X = 0 and 1.25
- B.
X = 0 and -5
- C.
X = 0 and -1.25
- D.
X = -1.25
- 5.Solve. x2 - 100 = 0
- A.
X =10
- B.
X = 50
- C.
X = 50 and -50
- D.
X = 10 and -10
- 6.Solve. x2 - 3x - 2 = 0
- A.
X =10 and -7
- B.
X is approximately 3.56 and -0.56
- C.
X is approximately 5.06 and -0.94
- D.
No real solutions
- 7.Which best describes the graph of a quadratic function?
- A.
A line.
- B.
A parabola
- C.
A v-shape.
- D.
A circle
- 8.How do you change the concavity of the graph of a quadratic function written in standard form?
- A.
Change the value of a to its opposite.
- B.
Change the value of b to its opposite.
- C.
Change the value of c to its opposite.
- D.
Take the square root of both sides.
- 9.Subtracting 7 from y=x2+2x will move the graph how?
- A.
Left 7.
- B.
Right 7.
- C.
Up 7.
- D.
Down 7.
- E.
None of these.
- 10.To make the graph y=x2+4x+7 grow faster (more narrow) I could do the following:
- A.
Change a to 1/2.
- B.
Change a to -1.
- C.
Change a to 3.
- D.
Change c to 10.
- 11.Can the graph of a quadratic function ever have three x-intercepts?
- A.
Yes.
- B.
No.
- 12.Quadratic functions have a line of symmetry. True or False?
- A.
True.
- B.
False.
- 13.The graph of y=x2 has a
- A.
Maximum
- B.
Minimum
- 14.Find the roots of y = x2 + 2x - 24
- A.
(0,6) and (0,-4)
- B.
(6,0) and (-4,0)
- C.
(0,-6) and (0,4)
- D.
(-6,0) and (4,0)
- 15.Identify the vertex of y = 2x2 + 12x + 3
- A.
(-3, -15)
- B.
(-3, -51)
- C.
(-6, 3)
- D.
(-6, -141)
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