Question

Помоги срочно вправа 811 812 813
дам 30 балов

Answer 1

$811. \\ a)2 {x}^{3} + 4x = 0 \\ 2x({x}^{2} + 2) = 0 \\ x = 0 \: \: \: x = + - \sqrt{2} \\ b) {x}^{3} - 11 {x}^{2} + 30x = 0 \\x = 0 \: \: \: {x}^{2} - 11 {x} + 30= 0\\x =- 6 \: \: \: x = - 5$