If you can answer this in less than 6 minutes, you're not human.

I probably worked on this problem for around 15 minutes and got bored so I didn't get to finish it. Well, my brother answered it in six minutes while I was watching. I couldn't believe my eyes. He's an even bigger math genius than I am.

[For those brave enough to accept the challege, comment below your answer and time. But I doubt anyone would be doing that. :))]

For those wanting a more challenging challenge, try factoring x³ – 19x + 30 in less than a minute. Yes, he did it in less than a minute. Guess how long it took me to solve that? Ten minutes. Probably longer if my professor didn't give us the next step. He seems to know all the shortcuts in algebra.