Advanced Math practice question

Answer: 4

Add 16: x² = 16. The solutions are 4 and −4; the positive one is 4.

Common wrong answers

If you answered 2

2² is 4, not 16. The number whose square is 16 is 4.

If you answered 8

8 is 16/2. Undoing a square means taking the square root, not halving: √16 = 4.

If you answered 16

16 is x², not x. Take the square root.

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