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Sagot :

AYUDA

a+b = 2√5-3 + 2√5+3 = 4√5

a-b = 2√5-3 - 2√5- 3 = -6

a²+b² = (2√5-3)² + (2√5+3)² = 20-6√5+9 + 20+6√5+9 = 58

axb = (2√5-3) (2√5+3) = (2√5)² - 3² = 20-9 = 11

et (a+b)² = (4√5)² = 90

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