Question

What number should be added to the expression x^2 + 12x to change it into a perfect square trinomial? Is 36 correct?

Answer 1

$x^{2} +12x+n^2 = x^{2} +2*6*x+n^2 \Rightarrow n=6. \\ \\ The~answer~is~36. \\ x^{2} +12x+36=(x+6)^2/$