a) 8^2 - 2*8*3pierw z 5 + (3pierw z 5)^2=
64- 48pierw z 5 + 9*5= 64+ 45- 48 pierw z 5= 109- 48 pierw z 5
b) (9- pierw z 2)(9+pierw z 2)= 9^2-(pierw z 2)^2= 81- 2= 79
c) (-2)^2 - 2 * (-2) * (-x/3) + (x/3)^2=
= 4 -4x/3 + x^2/9
d) (6a)^2 - (2b)^2= 36a^2 - 4b^2
