Question

p(x)=x
$x4 + 2x3 - x + 2 x = 2$

Answer 1

${x}^{4} + 2 {x}^{3 } - x + 2x = 2 \\ = > {x}^{4} + 2 {x}^{3} + x - 2 = 0$
When p(x) = x
${x}^{4} + 2 {x}^{3} + x - 2 = x \\ = > {x}^{4} + 2 {x}^{3} + x - x - 2 = 0 \\ = > {x}^{4} + 2 {x}^{3} - 2 = 0$