Multiple choice

Expand and simplify (1 - √2)2

  1. 3 - √4

  2. -1 - 2√2

  3. 3 - 2√2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Expanding (1 - sqrt(2))^2 gives (1 - sqrt(2))(1 - sqrt(2)) = 1 - sqrt(2) - sqrt(2) + (sqrt(2))^2 = 1 - 2*sqrt(2) + 2 = 3 - 2*sqrt(2).

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