Respuesta :

Steps for Perfect Square Trinomial
Step 1 :  Observe the given expression, it should be in the form of (a+b)2
Step 2 :  Apply the formula: (a+b)2= a2 + 2ab + b2
Step 3 :  Now, the final expression is the Perfect square trinomial expression.

Example: try D... is it a Perfect Square Tri ?