Advanced Math practice question

Answer: 6

Set equal: x² − 4 = 2x + 4, so x² − 2x − 8 = 0 and (x − 4)(x + 2) = 0. The x-coordinates are 4 and −2, which are 6 apart.

Common wrong answers

If you answered 2

2 is the sum of the x-coordinates (4 + (−2)), not the distance between them.

If you answered 4

4 is only the larger x-coordinate; the other is −2.

If you answered -8

−8 is the product of the x-coordinates.

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