Question
Answer
$$20\cdot\dfrac{j}{j+4}=\dfrac{20j}{j+4}$$
Explanation
| $$ \begin{aligned}20 \cdot \frac{j}{j+4}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{20j}{j+4}\end{aligned} $$ | |
| ① | Multiply $20$ by $ \dfrac{j}{j+4} $ to get $ \dfrac{ 20j }{ j+4 } $. Step 1: Write $ 20 $ as a fraction by putting $ \color{red}{1} $ in the denominator. Step 2: Multiply numerators and denominators. Step 3: Simplify numerator and denominator. $$ \begin{aligned} 20 \cdot \frac{j}{j+4} & \xlongequal{\text{Step 1}} \frac{20}{\color{red}{1}} \cdot \frac{j}{j+4} \xlongequal{\text{Step 2}} \frac{ 20 \cdot j }{ 1 \cdot \left( j+4 \right) } = \\[1ex] & \xlongequal{\text{Step 3}} \frac{ 20j }{ j+4 } \end{aligned} $$ |
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