Advanced Math practice question

Answer: 5

(x + 1)(x + 2) = x² + 3x + 2, and multiplying by x gives x³ + 3x² + 2x. So a + b = 3 + 2 = 5.

Common wrong answers

If you answered 2

2 is b alone.

If you answered 3

3 is a alone.

If you answered 6

6 is 1 + 2 + 3, adding the visible numbers.

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