Question

Różnica kwadratów liczb √2 +1 i 2-√2 jest równa??

Answer 1

(√2 + 1)² - (2 - √2)² =
= (√2)² + 2×√2×1 + 1² - (2² - 2×2×√2 +√2²) =
= 2 + 2√2 + 1 - (4 - 4√2 + 2) =
= 3 + 2√2 - 4 + 4√2 - 2 =
= -3 + 6√2 =
= 6√2 - 3 =
= 3)2√2 - 1)
Odpowiedź b)