1) To complete a square isolate the constant term, multiply everything by 4 times the coeficient of x^2, square the coefficient of x and add it to both sides. It looks like this

multiply through by 4*2 = 8

add (-3)^2 = 9 to both sides

The square has been completed on the left.

Take square root

add 3

divide by 4

2) To use the popular version of the quadratic formula set the equation to 0 then identify a, b, and c then plug into the formula.

a = c^2 - 1

b = -1

c = -1

plug it in

Simplify.