Question

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

Answer 1

Solution:

The square of the given equation can be completed as below:

Here we will make the terms on left hand side such that it gets the form of $a^2\pm2ab+b^2=(a\pm b)^2$

$x^2-x-3=0\\\\\text{Isolate the constant}\\\\x^2-x=3\\\\x^2-2\times\frac{1}{2}\times x +\frac{1}{2}^2=3+ \frac{1}{2}^2\\\\(x-\frac{1}{2})^2=\frac{13}{4}$

Hence the correct option is isolating the constant , -3.

Answer 2

Bao Yu should isolate the constant, -3