The square $x^2$ of a number $x$ simply means the product of $x$ with itself. For example, $3^2=3*3=9$. You can enter a number such as $3^2$ as 3**2 . (An expression such as $3^2$ or $x^2$ is called a power . We will learn a great deal more about powers during this semester.)
Enter here the expression $x^2$
The square root $\sqrt{x}$ of a number $x$ is a number whose square equals $x$. For example $\sqrt{25} = 5$ since $5^2=5*5 = 25$.
To enter square roots you can use the function sqrt . For example, to enter the square root of 2 you can type sqrt (2). Enter here the expression $\sqrt{a}$