In the following equation, find which variables $x, y, z$ etc. represent rational or irrational numbers:$ t^{2}=0.4 $
Given:
\( t^{2}=0.4 \)
To do:
We have to find whether $t$ represents a rational number or an irrational number.
Solution:
A rational number can be expressed in either terminating decimal or non-terminating recurring decimals and an irrational number is expressed in non-terminating non-recurring decimals.
$t^2=0.4$
$\Rightarrow t^2=(\sqrt{0.4})^2$
$\Rightarrow t=\sqrt{0.4}$
$\Rightarrow t=2\sqrt{0.1}$
$\Rightarrow t=2\sqrt{\frac{1}{10}}$
$\Rightarrow t=\frac{2}{\sqrt{10}}$
$\sqrt{10}$ is an irrational number.
Therefore, \( t \) is an irrational number.
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