Bao yu is completing the square to solve the polynomial equation.

x2 - x - 3 = 0

what should be her first step?

adding - x to both sides of the equation

adding - 3 to both sides of the equation

isolating the first term, x2

isolating the constant, - 3

To quote my answer to the question I answered (though you asked it first):

"The first step of completing the square, regardless of the problem, is making sure that the squared term doesn't have a coefficient. Since that's true for this equation, you isolate the constant, or - 3 in this case, which that would be the answer. You'd end up with x^2-x = 3."