Advanced Math practice question

Answer: 5

A square equals zero only when the inside is zero: x − 5 = 0, so x = 5.

Common wrong answers

If you answered 0

x = 0 gives (−5)² = 25, not 0.

If you answered 25

25 is 5²; the equation needs the binomial itself to vanish.

If you answered -5

Set the inside to zero: x − 5 = 0 gives x = +5.

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