ICSE Class 9 Answered
solve
Asked by psreeramasetty | 26 Jun, 2020, 07:20: PM
Expert Answer
(x + 3)3 - (x - 3)3
Let (x + 3) = m and (x - 3) =n
m3 - n3 = (m - n)(m2 +mn + n2)
= (x + 3 - x + 3)[(x + 3)2 + (x + 3)(x - 3) + (x - 3)2]
= 6(x2 + 6x + 9 + x2 - 9 + x2 - 6x + 9)
= 6(3x2 + 9)
= 18x2 + 54
Answered by Yasmeen Khan | 28 Jun, 2020, 08:42: PM
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