Answer:
a) (x+2)^2=2
Step-by-step explanation:
To complete the square, take the middle term bx and divide it in two. Then take the square.
6+12x+3x^2=0 should be rewritten as 3(x^2 + 4x) = -6 has bx = 4x. Take 4/2 = 2. Square 2^2 = 4.
Now to finish completing the square by adding 4 to each side.
3(x^2 + 4x + 4) = -6 + 3(4)
3(x^2 + 4x + 4) = -6 + 12
3(x+2)^2 = 6
(x+2)^2 = 2
