Can someone with this math question

Regarding question number 47, which is what I can read well ...
 Equation 4 (3x-2) ² = 36 It can be solved in the following way:
 -Apply distributive property
 4 (9x ²-12x +4) = 36
 -We order the terms and equalize to zero
 36x² -48x +16 -36 = 0
 36 x ² -48x -20 = 0
 The roots of this equation are
 (-48 +  √(48 ²-4 ×36 × -20)) / 2 ×36
 and
 (-48 -  √(48 ²-4 × 36 ×-20)) / 2 ×36
 Finally the solution is:
 option C
 x = -1 / 3
 x = 5/3