Quadratic Exploration Worksheet With Answer Key Page 4
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12ID: A
3. ANS: B
b
2
For a quadratic function y = ax
+ bx + c , the axis of symmetry is the vertical line x = −
.
2a
2
y = 3 x
+ 6 x + 4
a = 3 , b = 6
Find the values of a and b.
b
6
x = −
Substitute the values into the formula.
= −
= −1
2a
2(3)
Feedback
The axis of symmetry of a parabola is a vertical line. All the points it contains have the
A
same x-value, so the variable in the equation should be x and not y.
Correct!
B
Use the formula x = -b/2a to find the axis of symmetry.
C
Use the formula x = -b/2a to find the axis of symmetry.
D
PTS: 1
DIF: Average
REF: Page 601
OBJ: 9-2.3 Finding the Axis of Symmetry by Using the Formula
NAT: 12.5.1.e
STA: A.A.41
TOP: 9-2 Characteristics of Quadratic Functions
4. ANS: A
PTS: 2
REF: 080813ia
STA: A.G.10
TOP: Identifying the Vertex of a Quadratic Given Graph
2
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