find the value of a cube - 27b cube if a - 3b = ( -6) and ab = ( -10 )
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Answer:
324
Step-by-step explanation:
(a-3b)³ = a³ - 27b³ -3.a.3b(a-3b)
=> (-6)³ = a³ - 27b³ - 9 . (-10).(-6)
=> a³ - 27b³ = -216 + 540
= 324
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