0 \\ 5 {x}^{2} > 20 \\ {x}^{2} > 4 \\ x = 2 \: \: \: and \: \: \: x = - 2 \\ - - - ( - 2) + + + 2 - - - " alt="20 - 5 {x}^{2} > 0 \\ 5 {x}^{2} > 20 \\ {x}^{2} > 4 \\ x = 2 \: \: \: and \: \: \: x = - 2 \\ - - - ( - 2) + + + 2 - - - " align="absmiddle" class="latex-formula">
х принадлежит (-2;2)