(a-b)³ = a³-b³-3ab(a-b)
3³= 81-3ab×3
27= 81-9ab
9ab = 81-27 = 54
ab=54/9 =6
(a-b)² =a²+b²-2ab
9= a²+b²-2×6
a²+b²= 9+12 =21
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Verified answer
(a-b)³ = a³-b³-3ab(a-b)
3³= 81-3ab×3
27= 81-9ab
9ab = 81-27 = 54
ab=54/9 =6
(a-b)² =a²+b²-2ab
9= a²+b²-2×6
a²+b²= 9+12 =21