Answer
$$-10x^2+2x-10-(10x^2+3)=-20x^2+2x-13$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-10x^2+2x-10-(10x^2+3)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-10x^2+2x-10-10x^2-3 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-20x^2+2x-13\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 10x^2+3 \right) = -10x^2-3 $$ |
| ② | Combine like terms: $$ \color{blue}{-10x^2} +2x \color{red}{-10} \color{blue}{-10x^2} \color{red}{-3} = \color{blue}{-20x^2} +2x \color{red}{-13} $$ |
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