Question
Answer
$$\dfrac{18}{2^2-20}=-\dfrac{9}{8}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{18}{2^2-20}& \xlongequal{ }\frac{18}{4-20} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{18}{-16} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-\frac{18}{16} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}- \, \frac{ 18 : \color{orangered}{ 2 } }{ 16 : \color{orangered}{ 2 }} \xlongequal{ } \\[1 em] & \xlongequal{ }-\frac{9}{8}\end{aligned} $$ | |
| ① | Place minus sign in front of the fraction. |
| ② | Divide both the top and bottom numbers by $ \color{orangered}{ 2 } $. |
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Simplify Rational Expressions