OK, composition of function F of G of X = 17. So in the F equation we're going to put the G equation of X ^2 - 5 X plus 12 equaling 17. So now in the F equation, we have 3 * X ^2 - 5 X plus 12 - 1 = 17. If we distribute things out, we need to get everything on one side. So we're going to have three X ^2 - 15 X plus 36 minus no plus 35 - 17 = 0 three X ^2 - 15 X plus 18. Now I can divide that entire equation 3 by three to make it easier to see about factoring. The two numbers that multiply to give us a +6 and add to give us a -5 are going to be -2 and -3. So X equal 2 and X equal 3.