The questions asks what the ( ? ) should be in: $$45x^2+26x-8=(5x+4)(\quad?\quad)$$ To solve for the ( ? ), we need to perform the following: $$ \begin{pmatrix}5&4\\\color{red}{\frac{45}{5}}&\color{red}{\frac{-8}{4}}\\ \end{pmatrix} \Rightarrow \begin{pmatrix}5&4\\\color{red}{9}&\color{red}{-2}\\ \end{pmatrix}\\$$ $$\Rightarrow (\quad?\quad) = (9x-2)$$