a)
(√7)³ = √7 . √7 . √7
(√7)³ = (√7)² . √7
(√7)³ = 7 . √7
(√7)³ = 7√7
b)
( √5‐ √3)² = ( √5‐ √3) . ( √5‐ √3)
( √5‐ √3)² = √5 . √5 + √5 . (-√3) + (-√3) . √5 + (-√3) . (-√3)
( √5‐ √3)² = (√5)² - √(5.3) - √(3.5) + (√3)²
( √5‐ √3)² = 5 - √15 - √15 + 3
( √5‐ √3)² = 8 - 2√15
ou
( √5‐ √3)² = 2 . (4 - √15)
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a)
(√7)³ = √7 . √7 . √7
(√7)³ = (√7)² . √7
(√7)³ = 7 . √7
(√7)³ = 7√7
b)
( √5‐ √3)² = ( √5‐ √3) . ( √5‐ √3)
( √5‐ √3)² = √5 . √5 + √5 . (-√3) + (-√3) . √5 + (-√3) . (-√3)
( √5‐ √3)² = (√5)² - √(5.3) - √(3.5) + (√3)²
( √5‐ √3)² = 5 - √15 - √15 + 3
( √5‐ √3)² = 8 - 2√15
ou
( √5‐ √3)² = 2 . (4 - √15)