How to easily calculate the square of 1.2222 multiplied by 9-1.3333 multiplied by 4?

How to easily calculate the square of 1.2222 multiplied by 9-1.3333 multiplied by 4?

(1.2222)^2*9-(1.3333)^2*4=((1.2222)*3)^2-((1.3333)*2)^2=(3.6666+2.6666)(3.6666-2.6666)=6.3332