Advanced MathVery hardMinimum of a quadratic from its factored form
Advanced Math practice question
The function k is defined by k(x) = 3(x − 1)(x − 3). What is the minimum value of k(x)?
Answer: -3
The vertex is midway between the zeros at x = 2, and k(2) = 3(1)(−1) = −3.
Common wrong answers
- If you answered 2
- 2 is the x-coordinate of the vertex.
- If you answered 3
- 3 is the leading coefficient.
- If you answered -1
- −1 forgets the factor of 3.
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