Oblicz:
[(4-√15)¹′²+(4+√15)¹′²]² = [√(4-√15)+√(4+√15)]² = (√(4-√15))² + 2*√(4-√15)√(4+√15) +(√(4+√15))² = 4-√15 + 2*(4-√15)( 4+√15) + 4+√15 = 8 + 2*(16-15) = 8 +2 = 10
( te liczby w nawiasie na ciemno są pod pierwiastkiem
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[(4-√15)¹′²+(4+√15)¹′²]² = [√(4-√15)+√(4+√15)]² = (√(4-√15))² + 2*√(4-√15)√(4+√15) +(√(4+√15))² = 4-√15 + 2*(4-√15)( 4+√15) + 4+√15 = 8 + 2*(16-15) = 8 +2 = 10
( te liczby w nawiasie na ciemno są pod pierwiastkiem