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)b2 + 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)2 - (2b)3
= a3 - 6a2b + 12ab2 - 8b3 ....... (m - n)3 = m3 - 3m2 n + 3mn2 - n3
Answered by Yasmeen Khan | 08 Apr, 2020, 10:02: PM
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