Or you could think of scaling the whole expression by one over the natural log of four. But we can now use this information because y, this y can be viewed as v of, v of, remember v is the log base four of something. But it's not v of x. We don't have just an x here. We have the whole expression that defines u of x. We have u of x right there. And let me draw a little line here so that we don't get those two sides confused.