Voyage 200 shown, Steps are same for TI 89 or 92
Type the general form of the quadratic equation
Subtract c from both sides
Divide both sides by a
Add (b/(2a))^2 to both sides
Factor the result
Multiply both sides by 4*a^2
Take the square root of both sides, noting b^2-4ac>=0
Solve for x
Done!
