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(3-√5)²=9-6√5+5=14-6√5
(-2+√3)²=(√3-2)²=3-4√3+4=7-4√3
(-2-√6)²=4+4√6+6=10+4√6
b) (3-√5)=9-6√5+5=14-6√5
c) (-2+√3)=4-4√3+3=7-4√3
d) (-2-√6)=4+4√6+6=10+4√6