Advanced Math practice question

Answer: 5

Factor: x(x − 5) = 0, so x = 0 or x = 5. The positive one is 5.

Common wrong answers

If you answered 0

0 is a solution, but it isn't positive.

If you answered -5

−5 gives 25 + 25 = 50, not 0; and the question asks for the positive solution.

If you answered 2.5

2.5 is the x-coordinate of the vertex of y = x² − 5x, not a solution.

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