Use a graph of f or some other method to determine what, if any, value to assign to f(a) to make f continuous at X = a. (If there is no such value, enter NONE.)

[-/0.66 Points] DETAILS WANEAC7 3.2.026. Use a graph of for some other method to determine what, if any, value to assign to f(a) to make f continuous at x = a. (If there is no such value, enter NONE.) f(x) = x2 + 10x + 21 ; a = -3 x + 3 Need Help? Read It Watch It