Quadratic Formula Is there an app to plug in numbers?

[Stevetuc]

(10-21-2020 06:36 PM)Carsen Wrote:  I think the best tool Prime provides to solve polynomials is the command: proot.

I prefer proot for the following reasons

• Faster to type. Just enter the coefficients in brackets [ ]. Rather than typing an equation.
• Solves for real and complex roots. The methods mentioned above do not compute complex roots.
  

The command proot is accessed with the Toolbox key > CAS menu > 6. Polynomial > 1. Find Roots

Example: Find roots for x^2+4x+5.

Code:

proot([1,4,5])                    [(-2,-1)  (-2,1)]

There are other useful commands in the Polynomial menu too. Such as solving for the coefficients instead of the roots. I recommend it.

Quadsolve does solve for complex roots

Try

Code:

QuadSolve(1,-1,6^2+31^2)

Gives

Code:

{0.5+31.5713477698*i,0.5-31.5713477698*i}