$\left(9m+2n\right)^2$  

(a)  

 $\left(x+5\right)^2$  

(a)  

 $\left(2y+3\right)^2$  

(a)  

(7a+5b)²

(a)  

 $\left(2a+9\right)^2$  

(a)  

 $\left(4x+1\right)^2$  

(a)  

 $\left(6x+5y\right)^2$  

(a)  

 $\left(4m+7n\right)^2$  

(a)  

 $\left(6p+2q\right)^2$  

(a)