Question

Cum se face, ca nu stiu

Answer 1

$\sqrt[3]{ {x}^{3} + x + 1} = x \: | {( \: )}^{3}$

${x}^{3} + x + 1 = {x}^{3}$

$x + 1 = 0$

$x = - 1$

Answer 2

$\sqrt[3]{ {x}^{3} + x + 1 } = x \\ \\ \sqrt[3]{ {x}^{3} + x + 1 } ^{3} = {x}^{3} \\ \\ {x}^{3} + x + 1 = {x}^{3} \\ \\ x + 1 = 0 \\ \\ x + 1 - 1 = 0 - 1 \\ \\ x = - 1$