Advanced Math practice question

Answer: 11

Set equal: x² − 2x = x + 4, so x² − 3x − 4 = 0, (x − 4)(x + 1) = 0. At x = 4, y = 8; at x = −1, y = 3. Sum: 8 + 3 = 11.

Common wrong answers

If you answered 3

3 is the sum of the x-coordinates (4 + (−1)), not the y-coordinates.

If you answered 8

8 is only P's y-coordinate; Q's is 3.

If you answered -4

−4 is the product of the x-coordinates.

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