# Is x^2 + 10x + 100 a perfect square trinomial and how do you factor it?

Perfect square trinomials are of the form: ${\left(a + b\right)}^{2} = {a}^{2} + 2 a b + {b}^{2}$ then: ${x}^{2} + 10 x + 100$ is not a perfect square trinomial: $a = x , b = 10 , 2 a b = 20 x$