Question

What should be added to $1+2x-3x^{2}toget{x}^2-x-1$?

Answer 1

Given polynomial $1+2x-3x^2$

Let polynomial p(x) when added to $1+2x-3x^2$ to get $x^2-x-1$

$i.e.p\left(x\right)+1+2x-3x^2=x^2-x-1$

$p\left(x\right)=x^2-x-1-1-2x+3x^2$

$p\left(x\right)=4x^2-3x-2$