Question 729845
how do I work such a problem as y=x^2-4x-9 to obtain x-intercepts on graph.

my answer is 2+√13 and 2-√13.  Is this correct.  Thank you for your help. 
------------
You can complete the square, or use the quadratic equation.
------------
*[invoke solve_quadratic_equation 1,-4,-9]
===================
The on site solver doesn't reduce the terms, your answers are correct.