Question
Answer
$$6x^2+2x-(-9x^2-10x)=15x^2+12x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}6x^2+2x-(-9x^2-10x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6x^2+2x+9x^2+10x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}15x^2+12x\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -9x^2-10x \right) = 9x^2+10x $$ |
| ② | Combine like terms: $$ \color{blue}{6x^2} + \color{red}{2x} + \color{blue}{9x^2} + \color{red}{10x} = \color{blue}{15x^2} + \color{red}{12x} $$ |
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