Question
Answer
$$l\cdot1^2w^2-2l\cdot1mpw^2+mp^2w^2+zp^2=-2lmpw^2+mp^2w^2+lw^2+p^2z$$
Explanation
| $$ \begin{aligned}l\cdot1^2w^2-2l\cdot1mpw^2+mp^2w^2+zp^2& \xlongequal{ }l\cdot1w^2-2l\cdot1mpw^2+mp^2w^2+zp^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2lmpw^2+mp^2w^2+lw^2+p^2z\end{aligned} $$ | |
| ① | Combine like terms: $$ -2lmpw^2+mp^2w^2+lw^2+p^2z = -2lmpw^2+mp^2w^2+lw^2+p^2z $$ |
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