So f prime of x, f prime of x is equal to four times 1 1⁄2, which is two over the square root of four x minus three. Four x minus three to the 1 1⁄2 would just be the square root of four x minus three, but it's the negative 1 1⁄2, so we're gonna put it in the denominator right over here. And so f prime of c, we could rewrite this as two over the square root of four c minus three. And what is that going to be equal to? That is going to be equal to, let's see, f of three we already figured out is three. F of one we already figured out is one. And so we get three minus one over three minus one.