Question
Answer
$$15x^2-(6x^2-10x-4)=9x^2+10x+4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}15x^2-(6x^2-10x-4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15x^2-6x^2+10x+4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9x^2+10x+4\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 6x^2-10x-4 \right) = -6x^2+10x+4 $$ |
| ② | Combine like terms: $$ \color{blue}{15x^2} \color{blue}{-6x^2} +10x+4 = \color{blue}{9x^2} +10x+4 $$ |
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