The input line above is an example of writing the definition of y as the cubic polynomial in x. There are two items you should notice in the above command that are peculiar to the Mathematica program:
· "x cube"and "x square" are typed using the carat (^ ) .
· product "9 x" does not need a multiplication symbol. Two possible
forms are: with a space as in "9 x" or with an asterisk as in "9*x".