16Hit 1600
Advanced MathEasy–MediumSmaller zero of a quadratic

Advanced Math practice question

The function f(x) = x² − 6x + 8 has two zeros. What is the smaller of the two?

Answer: 2

x² − 6x + 8 = (x − 2)(x − 4), so the zeros are 2 and 4; the smaller is 2.

Common wrong answers

If you answered 4
4 is the larger zero.
If you answered 8
8 is the constant term, the product of the zeros.
If you answered -2
The factors are (x − 2)(x − 4); both zeros are positive.

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