16Hit1600
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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