Advanced Math practice question

Answer: -3

x² + 6x + 9 = (x + 3)², so x = −3.

Common wrong answers

If you answered 3

3 gives 9 + 18 + 9 = 36.

If you answered -9

−9 is the constant term, not the root.

If you answered -6

−6 is the middle coefficient.

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