Advanced Math practice question

Answer: 7

The x² terms give 2a = 6, so a = 3. The constants give −3b = −12, so b = 4. (Check: 2b − 3a = 8 − 9 = −1.) So a + b = 7.

Common wrong answers

If you answered 1

1 subtracts b from a.

If you answered 12

12 is 3 × 4, the product.

If you answered -1

−1 is the middle coefficient, not a + b.

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