Two to the negative two. Two to the negative two is equal to one over two squared, which is equal to 1 4th. So this is negative 12 times 1 4th. Negative 12 times 1 4th is negative three. So it's negative three plus c. Now we can add three to both sides to solve for c. We get 15 is equal to, 15 is equal to c. So, or c is equal to 15. That is equal to 15. And so now we can write our f of x as we get f of x is equal to negative 12, and I could even write that as negative 12 over x squared if we like.