solve

Asked by psreeramasetty | 26th 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 | 28th Jun, 2020, 08:42: PM