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