So this power is negative four x. And then we just took the natural log of the right-hand side as well. And then to solve for x, we can divide both sides by negative four. So you get x is equal to, or we could multiply both sides by negative one-fourth either way. Negative one-fourth natural log of three-fourths. And what we need to do is verify that this x, so we used this case right over here. We used that case, but we have to make sure that this x, that we can use this case, that this x is greater than zero.