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ICSE Class 8 Answered

expand: 1. (2a+b)3 2. (a-2b)3 3. (3x-2y)3 4. (x+5y)3
Asked by rainikita525 | 08 Apr, 2020, 12:32: PM
Expert Answer
1. (2a+b)3
= (2a)3 + 3(2a)2 b + 3(2a)b+ b3    
= 8a3 + 12a2b + 6ab2 + b3  ..... (m + n)3  = m3   + 3m2 n + 3mn2 + n3   
 
 
 
 
2. (a-2b)3
= (a)3 - 3(a)2 2b + 3(a)(2b)- (2b)3
= a3 - 6a2b + 12ab- 8b3 ....... (m - n)3  = m3   - 3m2 n + 3mn2 - n3   
 



     
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