Answer
$$7x^2+x-(9x^2+4x)=-2x^2-3x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7x^2+x-(9x^2+4x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7x^2+x-9x^2-4x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-2x^2-3x\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 9x^2+4x \right) = -9x^2-4x $$ |
| ② | Combine like terms: $$ \color{blue}{7x^2} + \color{red}{x} \color{blue}{-9x^2} \color{red}{-4x} = \color{blue}{-2x^2} \color{red}{-3x} $$ |
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