Question

( 3^11 - 4) * (3^11 + 4)

Answer 1

(3¹¹)²-16= 3²²-16= 31381059593 .

Answer 2

$(3 ^{11} -4))(3 ^{11} +4)=(3 ^{11} ) ^{2} -4 ^{2} = \\ \\ =3 ^{22} -16$