Question
Answer
$$x(1+2x+x)=3x^2+x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}x(1+2x+x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x(3x+1) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}3x^2+x\end{aligned} $$ | |
| ① | Combine like terms: $$ 1+ \color{blue}{2x} + \color{blue}{x} = \color{blue}{3x} +1 $$ |
| ② | Multiply $ \color{blue}{x} $ by $ \left( 3x+1\right) $ $$ \color{blue}{x} \cdot \left( 3x+1\right) = 3x^2+x $$ |
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