Its information is often wrong, and not only that, it provide legitimate looking fake links also if you ask for source. Even if you ask it for school level maths, it does it wrongly.
For simple things it might ne providing good enough info, but I still wouldn't trust it at all.
Choose any topic where you are sufficiently proficient and ask it questions about it.
Asking it to directly do math is simply the wrong approach. Like using a car to paint lines on a road. It kind of can do it, but not really. You can ask it for instructions how to do the calculation or for code that does it. Or get the GPT Wolframalpha plugin and let that do it directly.
Seems like the results are hit and miss. I don't know why. I never thought much about how I please something, but maybe it does matter and I just happen to do it right?