# Is there a way to get a grey check mark for a math input with multiple possibilities?

Hi, I searched through the boards but couldn’t find what I was looking for. I’m looking for a student to enter a quadratic equation in math input. I want to get a grey check mark if they use y =; f(x) =, or just the expression. So is there a way to get a grey check mark if they entered
f(x) = x^2 or y = x^2 or just x^2? Or can I only get a checkmark for one of these possibilities? Thanks!

Hi! One option would be something like:

``````answer = firstDefinedValue(parseEquation(input).rhs, input.latex)
``````

Then if students enter something like y= or f(x)= only the expression after the equal sign is considered. If there’s no equal sign, the whole input is considered. I hope that helps!

PS - The first correctness option I entered checks the function by evaluating it at a random input just in case a student entered the function in an unexpected format like `1x^2` that doesn’t exactly match `x^2`.

Thank you for the reply. I got warnings on them both. It didn’t find a latex argument and said something about a component with a really long code after it. Then the correct part wouldn’t work because the answer part wouldn’t work. I’m not really sure what a parseEquation refers to. I tried looking through the CL documentation but it didn’t seem like what I was looking for. Here’s a picture of what I have. Unfortunately I don’t really understand much of the CL language and the tutorials help but don’t have exactly what I’m looking for.

Sorry, I had a couple errors in my initial reply - I should have taken the time to test it out first!

(1) Where I typed `input`, it should say `this` since you are putting the check for correctness inside the math input component (`this` just means “the component this script is inside of”)
(2) It should have been `parseEquation(this.latex).rhs` instead of `parseEquation(this).rhs`

The `parseEquation(this.latex).rhs` is basically saying, if a student enters an equation, only look at the right-hand side. So if I type y=x^2 or f(x)=x^2, only look at the x^2.

I hope that clarifies a bit - I’m happy to try and rephrase or go more in depth if not. Here’s a simplified version of the activity you described:

This is perfect! Thank you so much!

Have a good week, Kori

1 Like