Question

What number would you add to the equation below to complete the square?
x^2+6x=23 Do I add 9 to both sides?

Answer 1

Yep, you got it.

Answer 2

The point is to make part of it look like (x+3)^2 so that you can square root both sides to get the + and - roots.

Answer 3

Thanks. I just Take the half of 6 and Square root it?

Answer 4

Almost, you take half of 6 and square it, not square root it.

Answer 5

If you foil out (x+3)(x+3) you get x^2+3x+3x+9 right? the 2 comes from having 2*(3x) terms.

Answer 6

That's what I mean :D

Answer 7

Awesome =)