Question

ayúdenme por favor :,(​

Answer 1

$a + b = 3 \\ {a}^{2} + {b}^{2} = 7 \\ ab = ? \\ (a + b) {}^{2} = {a}^{2} + {b}^{2} + 2ab \\ (3) {}^{2} = 7 + 2ab \\ 9 = 7 + 2ab \\ 9 - 7 = 2ab \\ 2 = 2ab \\ \frac{2}{2} = ab \\ 1 = ab$