So we just have to figure out what our cost is. And we already know what our cost is as a function of x. So we just have to put 1.65 into this equation, evaluate the function at 1.65. So let's do that. We get our cost is going to be equal to 20 times 1.65. I should say approximately equal to, because I'm using an approximation of this original value. 1.65 squared plus 180.