Question

How do you solve the equation `x^2 - 4x = 4`?

Answer 1

`x^2-4x=4`

`=>x^2-4x+4=8`

`a = x`
`b = 2`

`a^2-2ab+b^2 = (a-b)^2`

`(x-2)^2=8`

`x-2 = sqrt(8)` or `-sqrt(8)`

`x_1 = sqrt(8)+2`

`x_2= -sqrt(8)+2`