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i. (√5+3)²= 5+6√5+9=14+6√5
ii. (√5-2)²=5-4√5+4=9-4√5
→ (√5+3)²+(√5-2)²-2√5 = 14+6√5+9-4√5-2√5 = 21
2) propiedad: a²-b²= (a+b)(a-b)
[a(a+b)²(a-b)]/(a²-b²) = [a(a+b)²(a-b)]/[(a+b)(a-b) = [a(a+b)(a+b)(a-b)]/(a+b)(a-b) = a(a+b)= a²+ab