Find a function of such that ?Is there a bug or am I simply making a mistake in the following example?:

Question:

My Answer:

sqrt(1/5 * x^2 - 1)

I ask because the program does not say that it's wrong but it doesn't say that it's right either. In fact, it says "Can't generate enough valid points for comparison." So, IF I am right, I am going to email my teacher to inform him so if anyone could confirm, it would be greatly appreciated!

Thanks in advance!