Question
Answer
$$3x^2+5x+4-(-x^2+3x)=4x^2+2x+4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3x^2+5x+4-(-x^2+3x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x^2+5x+4+x^2-3x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4x^2+2x+4\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -x^2+3x \right) = x^2-3x $$ |
| ② | Combine like terms: $$ \color{blue}{3x^2} + \color{red}{5x} +4+ \color{blue}{x^2} \color{red}{-3x} = \color{blue}{4x^2} + \color{red}{2x} +4 $$ |
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