Question

7 x ao quadrado - 10 = 0​

Answer 1

$7 {x}^{2} - 10 = 0 \\ 7 {x}^{2} = 10 \\ {x}^{2} = \frac{10}{7} \\ x = \sqrt{ \frac{10}{7} } \\ x = \frac{ \sqrt{10} }{ \sqrt{7} } \times \frac{ \sqrt{7} }{ \sqrt{7} } \\ x = \frac{ \sqrt{70} }{7}$