Question

How do you solve by completing the square `x^2+8x=9`?

Answer 1

`x^2+8x-9=0`
`(x^2 +8x +(8/2)^2 -(8/2)^2) - 9 = 0`
`(x^2+8x+16-16) - 9 = 0`
`(x^2+8x+16) - 16 - 9 = 0`
`(x+4)^2 - 25 = 0`