Advanced Math practice question

Answer: 1

x² + 6x + 9 = (x + 3)², so the equation is (x + 3)² = 0, which is true only when x = −3. One distinct solution.

Common wrong answers

If you answered 0

The equation does have a solution: x = −3 gives 9 − 18 + 9 = 0.

If you answered 2

2 is the usual count for a quadratic, but here both roots coincide at x = −3.

If you answered 3

3 is the number in the factor (x + 3), not a count of solutions.

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