First, subtract both sides by 25:
x^2 - 6x = -25
Because we're completing the square, we subtract both sides by 9:
x^2 - 6x - 9 = -34
(x - 3) = 5.831 (about)
x = 8.831
Move all terms to the left side and set equal to zero. Then set each factor equal to zero.
x=2
Subtract 7.8 points by 4.8 and you get 3.4 !!
