Tap the blue circles to see an explanation.
$$ \begin{aligned}x^2-4x-(6x^2-10)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2-4x-6x^2+10 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-5x^2-4x+10\end{aligned} $$ | |
① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 6x^2-10 \right) = -6x^2+10 $$ |
② | Combine like terms: $$ \color{blue}{x^2} -4x \color{blue}{-6x^2} +10 = \color{blue}{-5x^2} -4x+10 $$ |