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a) (3+ √2)²= 3²+ 2*3*√2+(√2)²= 9+6√2+2= 11+6√2
b) (√3-2)(√3+2)= 3+2√3-2√3-4=-1
c) (√2-4)³=√2³-3√2²*(-4)+ 3*√2*(-4)²-(-4)³= 2√2+24+48√2+64= 50√2+88