Question

How do you complete the square for `x^2 + 6x + 2`?

Answer 1

`x^2+6x+2 = x^2+6x+9-2 = (x+3)^2-2`

In general

`ax^2+bx+c = a(x+b/(2a))^2 + (c-b^2/(4a))`