Question
Answer
$$7c\cdot2-4c\cdot7c-4=-28c^2+14c-4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7c\cdot2-4c\cdot7c-4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}14c-28c^2-4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}-28c^2+14c-4\end{aligned} $$ | |
| ① | $$ 7 c \cdot 2 = 14 c $$ |
| ② | $$ 4 c \cdot 7 c = 28 c^{1 + 1} = 28 c^2 $$ |
| ③ | Combine like terms: $$ -28c^2+14c-4 = -28c^2+14c-4 $$ |
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