Advanced Math practice question

Answer: 2

x⁴ = 16 means x² = 4 (x² = −4 has no real solutions), so x = 2 or x = −2. Two real values.

Common wrong answers

If you answered 0

2⁴ = 16, so there are certainly real solutions.

If you answered 1

1 misses the negative root: (−2)⁴ = 16 as well.

If you answered 4

4 counts the complex solutions too (±2 and ±2i); only two are real.

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