For both of these problems, you take the factor that is given and set it equal to 0. Then, you solve for x. The answer for x is what you will plug into the function. Make sure to set the function equal to 0 when solving. Plug in your answer for x into the function (for problem 10, plug in 1, and for problem 11, plug in -3). Combine like terms until you get two values, one integer and one value with a variable. Then, just solve for the variable you wish to find. For problem 10, a = 2. For problem 11, b = 16.