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