[tex] \sqrt{50} x + 15 = 0 \\ \sqrt{50} x = - 15 \\ x = - \frac{15}{ \sqrt{50} } \\ \\ x = - \frac{15 \times \sqrt{50} }{ \sqrt{50 \times \sqrt{50} } } \\ \\ x = - \frac{15 \sqrt{50} }{50} \\ \\ x = - \frac{3 \sqrt{50} }{10} = - \frac{3 \times 7.07}{10} = \\ \\ x = \frac{21.21}{10} = 2.121[/tex]
