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