pls szybko bardzo proste daje naj :))))))))))

a,b > 0
a² + b² = 11
a · b = 7
a + b = ?
a² + b² = (a + b)² - 2ab
11 = (a + b)² - 2 · 7
11 = (a + b)² - 14
(a + b)² = 11 + 14
(a + b)² = 25 |√
Odp. C.