Question

Kelly is solving x^2 - 4x = 7 by completing the square. What number will Kelly add to both sides of the equation?

x^2 - 4x + ___ = 7 + ____

Answer 1

To complete the square, you add
`(b)/(2)^2` to both sides

so
`(4)/(2)^2`

`2^2`

4

`x^2 - 4x + 4=7 + 4`