Name _______________________________________ Date __________________ Class __________________
LESSON
9-1
Practice 9.1
Identifying Quadratic Functions
Tell whether each function is quadratic. Explain.
1.
2. y + 5 = 2x2
x
1
2
3
4
5
y
0
3
8
15
24
no theirs no pattern for the y numbers
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yes
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Tell whether the graph of each quadratic function opens
upward or downward.
3. y = −5x2
4. y = 2x2 + 7
down
up
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Use the graph of the quadratic function below for questions 6−8.
5. Identify the vertex of the parabola.
-2,-6
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6. Give the minimum or maximum value.
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6,1
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9-3
Holt McDougal Algebra 1