Advanced MathEasy–MediumVertex of a parabola from its factored form
Advanced Math practice question
In the xy-plane, the graph of y = (x − 1)(x − 5) is a parabola. What is the x-coordinate of its vertex?
- A. 3Correct
- B. 1
- C. 5
- D. −5
Answer: A. 3
The vertex lies midway between the zeros 1 and 5, at x = 3.
Why the other answers are wrong
- B. 1
- 1 is a zero, not the vertex.
- C. 5
- 5 is a zero.
- D. −5
- −5 is the y-intercept's value, not the vertex's x.
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