A number of things are to be found when solving quadratics.
Firstly, the x values, or zeros, need to be found to see where the function crosses the x-axis.
The y-intercept can be found when x is 0.
Whether it opens upwards or down, wide or narrow, domain or range, and much more.
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It is finding the values of the variable that make the quadratic equation true.
That is what roots mean!
Trywww.mathsisfun.com/quadratic-equation-solver.html
By using the quadratic equation formula or by completing the square
Because when your solving a quadratic equation your looking for x-intercepts which is where why equals 0 and x equals what ever the answer is.