The roots of an equation in two variables is calculated by setting the dependent variable, y, equal to 0 and then solving the resulting equation for the independent variable, x. The procedure for solving the equation in x will depend on the nature of the equation.
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There are three zeros.
The discriminant is -27 and so there are no real roots.
You can approximate a square root as a decimal or fraction. If you want the exact number, you have to leave it with the square root sign.
If you calculate those square roots, you can count the integers in between pretty fast.
Not sure what answer you are looking for, but here are 4 types of roots in math. First is a square roots, next is cube roots, then the nth roots, and lastly rational roots.