Answer
$$-4x^2-3+4+3-5y^2+3y^2-5y^2=-4x^2-7y^2+4$$
Explanation
| $$ \begin{aligned}-4x^2-3+4+3-5y^2+3y^2-5y^2& \xlongequal{ }-4x^2 -\cancel{3}+4+ \cancel{3}-5y^2+3y^2-5y^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4x^2-7y^2+4\end{aligned} $$ | |
| ① | Combine like terms: $$ -4x^2 \, \color{blue}{ -\cancel{3}} \,+ \color{green}{4} + \, \color{green}{ \cancel{3}} \, \color{orange}{-5y^2} + \color{blue}{3y^2} \color{blue}{-5y^2} = -4x^2 \color{blue}{-7y^2} + \color{green}{4} $$ |
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