Question

How do you solve using completing the square method `x^2 - 4x = 5`?

Answer 1

`x= -1, 5`

Explanation:

`x^2 - 4x = 5`
`x^2 - 4x - 5 = 0`
`(x-2)^2 - 4 - 5 = 0`
`(x-2)^2 - 9 = 0`
`(x-2)^2 = 9`
`x-2 = pm 3`
`x= 2 pm 3 = -1, 5`