Question

If x - y = 5 and xy = 84 then, find the value of. X3 -y3​

Answer 1

Answer:

1.285

Step-by-step explanation:

Given = x - y = 5

            and xy = 84

To find = x3 - y3

Proof = x³ - y³ = (x - y) (x² + xy + y²)

           x³ - y³ = 5 (x² + y² + 84)

          x³ - y³ = 5 ((x - y)² + 2xy + 84)

         x³ - y³ = 5 (5² + 2 . 84 + 84)

         x³ - y³ = 5 . 257

         x³ - y³ = 1.285

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