Question
If x = 19 and y = 11, then find the value of
(y3 - x3 + 3x2y - 3y2x) .Solution
We know that (a - b) 3 = a3 - b3 - 3a2b + 3b2a
So, in given case, b = x = 19 and y = a = 11
So, required value = (11 - 19) 3 = -512
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