Find the value of (28)^3 - (78)^3 + (50)^3u200bu200bu200bu200bu200bu200bu200b

Question

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

Answer 1

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