So x is going to be equal to negative b, which is 12 plus or minus the square root. I always need to make my radical signs wide enough. The square root of b squared, which is 144, minus four times a, which is three, times c, which is five, times five. All of that, all of that over 2a. So two times three is six. So x is equal to 12 plus or minus the square root of, let's see, four times three is 12, times five is 60. 144 minus 60 is 84.