Dana jest liczba
wykaż, że liczba x jest naturalna.
x=(√3 - 2√2)² + 4√6 = (√3)² - 2*√3*2√2 + (2√2)² + 4√6 =
= 3 - 4√6 + 8 + 4√6 =
= 11 ∈ N
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x=(√3 - 2√2)² + 4√6 = (√3)² - 2*√3*2√2 + (2√2)² + 4√6 =
= 3 - 4√6 + 8 + 4√6 =
= 11 ∈ N