Quadratic Formula Is there an app to plug in numbers?
10-20-2020, 05:32 PM
Post: #1
 Subaru Junior Member Posts: 1 Joined: Oct 2020
Quadratic Formula Is there an app to plug in numbers?
Has somebody made an app that you plug in numbers in the quadratic Formula an you get your 2 answers? I want it to make school easy. Thanks for your time.
10-20-2020, 06:47 PM
Post: #2
 grsbanks Senior Member Posts: 1,154 Joined: Jan 2017
RE: Quadratic Formula Is there an app to plug in numbers?
Why would you want to do that? The Prime can solve quadratics without a program already.

E.g.

Code:
CAS.zeros('X²-6*X+2')             [5.6457....... 0.354248.....]

There are only 10 types of people in this world. Those who understand binary and those who don't.
10-20-2020, 06:56 PM
Post: #3
 Didier Lachieze Senior Member Posts: 1,227 Joined: Dec 2013
RE: Quadratic Formula Is there an app to plug in numbers?
You have also the built-in Explorer app.
10-20-2020, 07:18 PM
Post: #4
 KeithB Member Posts: 240 Joined: Jan 2017
RE: Quadratic Formula Is there an app to plug in numbers?
If those don't work for you, this is a nice little exercise for you to program yourself.
10-20-2020, 09:58 PM
Post: #5
 BruceH Senior Member Posts: 309 Joined: Dec 2013
RE: Quadratic Formula Is there an app to plug in numbers?
(10-20-2020 06:56 PM)Didier Lachieze Wrote:  You have also the built-in Explorer app.

Which can even be invoked directly
Code:
QuadSolve(1,0,-4)       {-2,2}
10-21-2020, 06:36 PM
Post: #6
 Carsen Member Posts: 199 Joined: Jan 2017
RE: Quadratic Formula Is there an app to plug in numbers?
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.
10-21-2020, 08:28 PM
Post: #7
 pinkman Senior Member Posts: 387 Joined: Mar 2018
RE: Quadratic Formula Is there an app to plug in numbers?
(10-20-2020 05:32 PM)Subaru Wrote:  Has somebody made an app that you plug in numbers in the quadratic Formula an you get your 2 answers? I want it to make school easy. Thanks for your time.

Hello Subaru,
Welcome!
Don’t be afraid, there is no stupid question here, we are all here to help you, and as you see, there are plenty of answers, even if we all think that there is no need to program the quadratic formula.

Thibault - not collector but in love with the few HP models I own - Also musician : http://walruspark.co
10-22-2020, 08:42 AM (This post was last modified: 10-22-2020 08:44 AM by Stevetuc.)
Post: #8
 Stevetuc Member Posts: 197 Joined: Jan 2014
RE: Quadratic Formula Is there an app to plug in numbers?
(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}
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