Question

What number should be added to both sides of the equation to complete the square?

x2 + 8x = 4

4
8
16
32

Answer 1

The ans is 16...U have to divide 8 by 2, then square it

Answer 2

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.