(w+x)(w+x) perfect square trinomials

(W+X)² = (W+X)(W+X) 

This can be expanded to; 

(W+X)(W+X)= W²+WX+WX+X²
=W²+2WX+X²

Perfect square trinomial states: if (W+X)² format is placed, the first term is squared, the last is squared and the middle term is a multiplication of squareroot values of W and X multiplied by 2. 

Hope I helped :) 

221,500 is the answer