Question

equacao do segundo grau! 2×ao quadrado-12 =109​

Answer 1

$2 {x}^{2} - 12 = 109 \\ 2 {x}^{2} - 12 - 109 = 0 \\ {2x}^{2} - 121 = 0 \\ 2 {x}^{2} - 121 + 121 = 0 + 121 \\ 2 {x}^{2} = 121 \\ {x}^{2} \times 2 \times \frac{1}{2} = 121 \times \frac{1}{2} \\ {x}^{2} = \frac{121}{2} \\ \sqrt{ {x}^{2} } = + - \sqrt{ \frac{121}{2} } \\ x = + - \frac{ \sqrt{121} }{ \sqrt{2} } \\ x = + - \frac{11 \sqrt{2} }{2}$