Advanced Math practice question

Answer: 4

(√x + 1)² = x + 2√x + 1 and (√x − 1)² = x − 2√x + 1; their difference is 4√x.

Common wrong answers

If you answered 0

0 assumes the squares are equal.

If you answered 1

1 comes from the constant terms, which cancel.

If you answered 2

2 counts only one of the two 2√x terms.

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