give me this math answer
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a+b = 6
ab = 8
(a+b) ³ = a³ +3a² b + 3ab² + b³
(a+b) ³ = a³ + b³ + 3ab (a+b)
( 6)³ = a³ +b³ + 3 × 8 x 6
216 = a³ +b³ +144
216 - 144 = a³ + b³
a³ + b³ = 72
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