Advanced MathEasy–MediumAxis of symmetry of a parabola in standard form
Advanced Math practice question
In the xy-plane, the graph of f(x) = 3x² − 12x + 7 is symmetric about the vertical line x = k. What is the value of k?
Answer: 2
The axis of symmetry is x = −b/(2a) = 12/6 = 2.
Common wrong answers
- If you answered 4
- 4 is −b/a, forgetting the 2.
- If you answered 7
- 7 is the constant term.
- If you answered -2
- −2 has the wrong sign; −b/(2a) = −(−12)/6.
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