So if we add 12.5 to both sides, we get 12.5 is equal to, if you add the x terms, you get square root of 3 over 18 plus 1 8th x. To solve for x, divide both sides by this business, you get x is equal to 12.5 over square root of 3 over 18 plus 1 over 8. And we are done. At x equals this, our derivative is equal to 0. Now, we know, I shouldn't say we're done yet. We don't know whether this is a minimum point. In order to figure out whether this is a minimum point, we have to figure out whether our function is concave upward or concave downward when x is equal to this business.