Advanced Math practice question

Answer: 4

The expression is undefined where the denominator is 0: x² − 16 = 0 → x = ±4. The positive value is 4.

Common wrong answers

If you answered 0

At x = 0 the expression equals (−4)/(−16), which is defined.

If you answered 16

16 is the constant in the denominator, not a value of x.

If you answered -4

−4 also makes the denominator 0, but the question asks for the positive value.

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