Question
Answer
$$r\cdot\dfrac{4}{r}-9=-5$$
Explanation
| $$ \begin{aligned}r\cdot\frac{4}{r}-9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4-9 \xlongequal{ } \\[1 em] & \xlongequal{ }-5\end{aligned} $$ | |
| ① | Multiply $r$ by $ \dfrac{4}{r} $ to get $ 4$. Step 1: Write $ r $ as a fraction by putting $ \color{red}{1} $ in the denominator. Step 2: Cancel $ \color{blue}{ r } $ in first and second fraction. Step 3: Multiply numerators and denominators. $$ \begin{aligned} r \cdot \frac{4}{r} & \xlongequal{\text{Step 1}} \frac{r}{\color{red}{1}} \cdot \frac{4}{r} \xlongequal{\text{Step 2}} \frac{\color{blue}{1}}{1} \cdot \frac{4}{\color{blue}{1}} = \\[1ex] &= \frac{4}{1} =4 \end{aligned} $$ |
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