Question
Answer
$$4x^2-2x-(7x^2-5x+4)=-3x^2+3x-4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4x^2-2x-(7x^2-5x+4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4x^2-2x-7x^2+5x-4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-3x^2+3x-4\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 7x^2-5x+4 \right) = -7x^2+5x-4 $$ |
| ② | Combine like terms: $$ \color{blue}{4x^2} \color{red}{-2x} \color{blue}{-7x^2} + \color{red}{5x} -4 = \color{blue}{-3x^2} + \color{red}{3x} -4 $$ |
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