Answer
$$3x^2y(-4xy^3)x^4=-12x^7y^4$$
Explanation
| $$ \begin{aligned}3x^2y(-4xy^3)x^4& \xlongequal{ }-12x^3y^4x^4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-12x^7y^4\end{aligned} $$ | |
| ① | $$ -12 x^3 y^4 x^4 = -12 x^{3 + 4} y^{4} = -12 x^7 y^4 $$ |
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