So 0.0001
and that equals to our exponent negative four. Here, to make this positive, I simply multiply both sides by negative one and I brought the negative to this side. And that's why this guy is positive. So for example, suppose if I had the ten and I had this value, but this was my unknown, I could simply use this to find my exponent. That's why logs are convenient whenever you don't know our exponent, but you know the result and you know the base. You can use longs to find the exponent.