Question

I don’t understand it doesn’t makes sense I try everything

Answer 1

To subtract:

$(6x^2-x+3)-(-5x^2_{}+10x-1)$

On subtraction we get,

$\begin{gathered} (6x^2-x+3)-(-5x^2_{}+10x-1)=6x^2-x+3+5x^2_{}-10x+1 \\ =11x^2-11x+4 \end{gathered}$

Hence, the solution is,

$11x^2-11x+4$