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(a+b)² = a² + 2ab + b² (a-b)² = a² - 2ab + b² )
(1+2√2)² =1 + 4√2 +8 = 9+4√2
(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)²=9-6√5+5=14-6√5
c) (-2+√3)²=4-4√3+3=7-4√3
d) (-2-√6)²=4+4√6+6=10+4√6