consider the steps for solving 3x^2 - 42x + 9 = -5 for x by completing the square.


step 1) 3x^2 - 42x = -14

step 2) 3(x^2 - 14x) = -14

step 3) 3(x^2 - 14x + 49) = -14 + ___


What number should be added to the right side of the equation?


Please help me !