Answer:
16
Step-by-step explanation:
The given equation is \(x^2+8x=4\)
Compare this with \(ax^2+bx=c\)
a = 1, b = 8, c=4
Now, in order to complete the square we add both sides by \((\frac{b}{2})^2\)
Thus, we find this value first
\((\frac{b}{2})^2\\\\=(\frac{8}{2})^2\\\\=4^2\\\\=16\)
Therefore, we add 16 to both sides of the equation to complete the squares.
Third option is correct.
