Evaluate the Expression for the Given Value or Values $( x + 3 y ) ^ { 2 } \text { when } x = 3 , y = 4$

Evaluate the expression for the given value or values.
- $( x + 3 y ) ^ { 2 } \text { when } x = 3 , y = 4$

A) 225
B) 30
C) 15
D) 36