Question 101578
I am guessing that when supply=demand then there is equilibrium and the demand equation equals the supply equation.
-200p+35000=-p^2+400p-20000
p^2-600p+55000=0
p=113, p=487
Ed
*[invoke solve_quadratic_equation 1, -600, 55000]
{{{graph(500,500,-500,750,-50000,50000,x^2-600x+55000)}}}