Here's my guide to program any ti-nspire calculator for the quad formula. It's helped me on many tests.
http://tinspiretips.tumblr.com/post/73575373857/how-to-solve-quadratic-functions-on-any-ti-nspire
Whay would you want to go through the hassle of writing a program to solve to solve a quadratic equation`The calculator has two buit-in command to do just that. It has Solve and cSolve (for complex solutions).
Open a calculator sheet, and on the command line, type in solve(ax^2+bx+c=0, x), press ENTER and wait for the solutions
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