16Hit1600
Advanced MathVery hardMinimum of a quadratic from its zeros

Advanced Math practice question

The graph of f(x) = (x − 1)(x − 5) in the xy-plane has a lowest point. What is the y-coordinate of that point?

Answer: -4

The vertex is midway between the zeros, at x = 3, and f(3) = (2)(−2) = −4.

Common wrong answers

If you answered 3
3 is the x-coordinate of the vertex.
If you answered 4
4 has the sign wrong.
If you answered 5
5 is f(0).

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