Question

помогите решить уравнения ,прошу вас

Answer 1

$\: \: \: x( {x}^{2} - 1) = 0 \\ x = 0 \: \: \: \: \: x {}^{2} = 1 \\ \: \: \: \: \ \: \: \: \: \: \: : \: \: \: x = 1$
$x(9 - {x}^{2} ) = 0 \\ x = 0 \: \: \: {x }^{2} = 9 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: x = 3 \: \: \: \: x = - 3$
${x}^{2} (x + 1) = 0 \\ x = 0 \: \: \: \: x = - 1$
$5 {x}^{2} ( {x}^{2} - 4) = 0 \\ 5x {}^{2} = 0 \: \: \: (x - 2) = 0 \: \: (x + 2) = 0 \\ \\ x = 0 \: \: x = 2 \: \: x = - 2$