If there is any previous data, click on Clear All to clear, avoiding possible errors.
So, the page should look like:

Now, suppose you are told to add 1234 + 5678 + 9012. As one may expect,
a polynomial calculator does the same as an ordinary calculator, plus more.
To solve 1234 + 5678 + 9012 write this mathematical expression in
the left box and click on Calculate:

Realize, the preceeding works the same for most of the math problems
the calculator can manage. Replace the above mentioned
1234 + 5678 + 9012
by, for example, (2*x+5)*(3*x2).
Proceed similarly and the answer will be the result of the product of two polynomials.
Likewise, replacing by 10  10 * sqr(x) = 0, the answer will
exhibit the solution to one equation.
