Answer
$$21x^2+8-(18x^2+10)=3x^2-2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}21x^2+8-(18x^2+10)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21x^2+8-18x^2-10 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}3x^2-2\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 18x^2+10 \right) = -18x^2-10 $$ |
| ② | Combine like terms: $$ \color{blue}{21x^2} + \color{red}{8} \color{blue}{-18x^2} \color{red}{-10} = \color{blue}{3x^2} \color{red}{-2} $$ |
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