Question
Answer
$$7-4x^2-(6+8x^2)=-12x^2+1$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7-4x^2-(6+8x^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7-4x^2-6-8x^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-12x^2+1\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 6+8x^2 \right) = -6-8x^2 $$ |
| ② | Combine like terms: $$ \color{blue}{7} \color{red}{-4x^2} \color{blue}{-6} \color{red}{-8x^2} = \color{red}{-12x^2} + \color{blue}{1} $$ |
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