Advanced Math practice question

Answer: 3

x² − 6x + 9 = (x − 3)², and dividing by (x − 3) leaves x − 3. So k = 3.

Common wrong answers

If you answered 6

6 is the middle coefficient.

If you answered 9

9 is the constant of the numerator, not after simplifying.

If you answered -3

−3 would give x + 3, the wrong sign.

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