1.

Find the value of (28)3 - (78)3 + (50)3

Answer»

Let a = 28, b = - 78, c = 50 

Then, a + b + c = 28 - 78 + 50 = 0 

∴ a3 + b3 + c3 = 3abc. 

 So, (28)3 + (-78)3 + (50)3  = 3 × 28 × (-78) × 50



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