CBSE Class 9 Answered
Using
suitable identity evaluate (-28)3 + (9)3 + (19)3
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
x3 + y3 + z3 = 3xyz if x + y + z = 0
Let x = -28
y = 9
z = 19
x + y + z = (-28) + (9) + (19)
= 0
(-28)3 + (9)3 + (19)3 = 3(-28) (9) (19)
= -14364
Answered by | 04 Jun, 2014, 03:23: PM
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