Question

me ajudem por favor

Answer 1

$x = \frac{ - b + \sqrt{ {b}^{2} - 4ac} }{2a} = \\ = \frac{7 + \sqrt{49 - 4 \times 1 \times 10} }{2} = \\ = \frac{7 + \sqrt{9} }{2} = \frac{7 + 3}{2} = \frac{10}{2} = 5$