Advanced Math practice question

Answer: 3

The roots multiply to 28 and add to 11: 7 and 4. So p − q = 3.

Common wrong answers

If you answered 11

11 is the sum of the roots, not their difference.

If you answered 28

28 is the product of the roots.

If you answered -3

p is the larger root (7), so p − q is positive.

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