So let's write this down. So when, so f, so f of two is equal to 12, which is equal to, well, we just have to put two in everywhere we see an x. That's going to be negative two times two to the negative two power plus c. And so 12 is equal to, what is this? 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.