What is the intermediate step in the form (x + a) ^(2) = b as a result of completing the square for the following equation​

Question

What is the intermediate step in the form


`(x + a) ^(2) = b`
as a result of completing the square for the following equation​

Answer 1

6x²+24x = 72
x²+4x = 12
x²+4x+2² = 12+2²
(x+2)² = 16
x+2 = ±4
x = -2 ±4 = 2,-6