Question

уравнение
срочноо
ср.

Answer 1

$2 {x}^{2} - 18 = 0 \\ 2 {x}^{2} = 18 \\ {x}^{2} = 18 \div 2 \\ {x }^{2} = 9 \\ x = - 3 \\ x = 3$