[tex]5 {x}^{2} - 15x = 0 \\ {x }^{2} - 3x = 0 \\ x(x - 3) = 0 \\ x_{1} = 0 \\ x_{2} = 3[/tex]
[tex]2 {x}^{2} -7 2 = 0 \\ {x}^{2} - 36 = 0 \\ {x}^{2} = 36 \\ x_{1} = 6 \\ x_{2} = - 6[/tex]
[tex]5 {x}^{2} + 100 = 0 \\ {x}^{2} + 20 = 0 \\ {x}^{2} = - 20[/tex]
нет решений
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[tex]5 {x}^{2} - 15x = 0 \\ {x }^{2} - 3x = 0 \\ x(x - 3) = 0 \\ x_{1} = 0 \\ x_{2} = 3[/tex]
[tex]2 {x}^{2} -7 2 = 0 \\ {x}^{2} - 36 = 0 \\ {x}^{2} = 36 \\ x_{1} = 6 \\ x_{2} = - 6[/tex]
[tex]5 {x}^{2} + 100 = 0 \\ {x}^{2} + 20 = 0 \\ {x}^{2} = - 20[/tex]
нет решений