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. Negative 12 over x squared plus 15. And now using that, we can evaluate f of negative one. f of negative one.