Advanced MathMediumAxis of symmetry from two zeros
Advanced Math practice question
The graph of the function f in the xy-plane crosses the x-axis at (−6, 0) and (2, 0), and f is a quadratic function. What is the x-coordinate of the vertex of the graph?
Answer: -2
The vertex lies midway between the zeros: (−6 + 2)/2 = −2.
Common wrong answers
- If you answered 2
- 2 has the sign wrong.
- If you answered 4
- 4 is half the distance between the zeros.
- If you answered -4
- −4 halves −8, the sum, and then errs; the midpoint is −2.
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