Advanced Math practice question

Answer: 1

Set them equal: 2x² − 3 = x² + x + 3, so x² − x − 6 = 0, which factors as (x − 3)(x + 2) = 0. The x-coordinates are 3 and −2, and their sum is 1.

Common wrong answers

If you answered 3

3 is only one of the two x-coordinates; the other is −2.

If you answered -1

−1 has the wrong sign: the roots are 3 and −2, summing to 1.

If you answered -6

−6 is the PRODUCT of the roots (the constant term), not their sum.

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