$$ \begin{aligned}3x^2+2y^2-5x+y+2x^2-2xy-2y^2-5x+3y& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5x^2-2xy-10x+4y\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{3x^2} + \, \color{red}{ \cancel{2y^2}} \, \color{orange}{-5x} + \color{blue}{y} + \color{blue}{2x^2} -2xy \, \color{red}{ -\cancel{2y^2}} \, \color{orange}{-5x} + \color{blue}{3y} = \color{blue}{5x^2} -2xy \color{orange}{-10x} + \color{blue}{4y} $$ |