Advanced Math practice question

Answer: 8

(4x)² = 16x², and 16x²/(2x) = 8x. So k = 8.

Common wrong answers

If you answered 2

2 divides 4 by 2 without squaring first.

If you answered 4

4 comes from (4x)² = 8x² (doubling instead of squaring the 4).

If you answered 16

16 forgets to divide by 2.

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