Advanced Math practice question

Answer: 12

(x + 1)(x + 2) = x² + 3x + 2, and multiplying by (x + 3) gives x³ + 6x² + 11x + 6, so a + c = 12.

Common wrong answers

If you answered 11

11 is b alone.

If you answered 17

17 is a + b.

If you answered 23

23 is a + b + c.

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