cubic equations, assumption

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Payton Kammerer 2B
Posts: 49
Joined: Tue May 01, 2018 3:00 am

cubic equations, assumption

Postby Payton Kammerer 2B » Mon Mar 09, 2020 11:36 am

Will we ever be in a position where the negligible x assumption in a cubic equation in a K calculation isn't appropriate? If so, how do we solve for x without a graphing calculator?

Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: cubic equations, assumption

Postby romina_4C » Mon Mar 09, 2020 12:03 pm

Usually if we are given a situation in which we can't ignore the x concentration (cannot follow the assumption), we will be able to solve the equation for x using the quadratic formula. I don't think Dr. Lavelle would give us a cubic equation which we would have to solve without the assumption.

Hannah Romeo 1J
Posts: 58
Joined: Thu Jul 11, 2019 12:16 am

Re: cubic equations, assumption

Postby Hannah Romeo 1J » Mon Mar 09, 2020 12:51 pm

Cubic equations are notoriously to difficult to solve, especially without a graphing calcuator, so I think that on the ones that we will be tested on, we can approximate the value of x given a small k value.

Frank He 4G
Posts: 50
Joined: Tue Nov 12, 2019 12:19 am

Re: cubic equations, assumption

Postby Frank He 4G » Sat Mar 14, 2020 9:32 pm

Either we have cubic equations where we can make the approximation, or we don't. We are definitely not expected to solve any cubic equations in this class.

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