Write the following cubes in expand form.
(a) ( a - 2b )³ (b) ( x - 2y/3 )³
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Write the following cubes in expand form.
(a) ( a - 2b )³ (b) ( x - 2y/3 )³
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To find :
Important Identity :
Solution :
(a) (a-2b)³
=> (a)³ - (2b)³ - (3)(a²)(2b) + 3(a)×(2b)²
=> a³ - 8b³ - 6a²b + 3a×4b²
=> a³ - 8b³ - 6a²b + 12ab²
(b) (x - 2y/3)³
=> (x)³ - (2y/3)³ - 3(x)²×(2y/3) + 3(x)×(2y/3)²
ANSWER :
(a) a³ - 8b³ - 6a²b + 12ab²
(b)