If a+b=5, ab=6 find the value a3-b3 =?
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(a+b)³=a³ + b³ + 3 ab(a+b)
(5)³ = a³ + b³ + 3×6(5)
125 = a³ + b³ + 18(5)
125 = a³ + b³ + 90
125 - 90 = a³ + b³
35 = a³ + b³
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