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4*2-2*2*√2*√3+3+4*3+2*2*√3*√2+2=
8-4√6+3+12+4√6+2=25
(3+√ 7)^2 - (3-√ 7)^2=9+6√7+7-(9-6√7+7)=16+6√7-16+6√7=12√7
(1-2√ 2)^2(9+4√ 2)=(1-4√2+4*2) (9+4√2)=(9-4√2)(9+4√2)=
9²-(4√2)²=81-16*2=81-32=49