I am trying to figure out a way to use formulas to ask questions regarding solving quadratic functions. I wrote some questions that ask for the discriminant but am stuck on how to write any relating to solving a quadratic.

Thanks for any help,

Julie

I am trying to figure out a way to use formulas to ask questions regarding solving quadratic functions. I wrote some questions that ask for the discriminant but am stuck on how to write any relating to solving a quadratic.

Thanks for any help,

Julie

- 2 people found this helpful
You are probably going to have to modify your expectations or decide that it's not worth it and look at using another question type instead of a formula question.

- You will not be able to ask for both roots since a formula question only accepts a single answer. You will need to ask for the smaller root or the larger root or for other combination like twice the larger solution minus three times the smaller solution.
- You will not be able to accept exact answers involving radicals or complex roots involving i. Formula questions only accept numeric responses in decimal form. Fractions are not allowed either.
- You cannot use a generated value in the text of the question. After being told you can't accept radicals, you may wish to generate integer or rational answers. That is, you may want to start with the solution and work backwards to the question, but you cannot do this. The random numbers generated are independent of each other, so there is no way to pick values for [a], [b], and [c] so that b^2 - 4ac turns out to be a perfect square.
- You cannot use the random variables inside an equation object, so any formatting of the question needs to be done using just text and or html. This also means that you need make sure that your random values are all on the same side of 0 so that you can format the question appropriately. You also need to make sure that they avoid 1 so you don't end up with things like 1x

If you are willing to accept decimal approximations, then you can do something like this:

- 2 people found this helpful
Thank you so much!

I was running into all the problems you stated, that is why I thought I would reach out & see if there was a way I overlooked. I was able to write questions giving the roots and asking for the coefficients of a certain term (quadratic, linear, or the constant). Almost all of my assessments are formula generated but sometimes it can be challenging writing for Algebra 2. Thank you again!

Julie Conrad,

You are probably going to have to modify your expectations or decide that it's not worth it and look at using another question type instead of a formula question.

If you are willing to accept decimal approximations, then you can do something like this: