Question
Answer
$$4x^2-4-(4-5x^2)=9x^2-8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4x^2-4-(4-5x^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4x^2-4-4+5x^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9x^2-8\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 4-5x^2 \right) = -4+5x^2 $$ |
| ② | Combine like terms: $$ \color{blue}{4x^2} \color{red}{-4} \color{red}{-4} + \color{blue}{5x^2} = \color{blue}{9x^2} \color{red}{-8} $$ |
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