Question

If x-y=4and xy=21 find the value of x3-y3 by using formula a3-b3 -3ab a-b

Answer 1

Answer:

316

Explanation:

Given that : x-y =4

xy= 21

x^3 -y^3 = (x-y)^3 + 3xy (x-y)

= (4)^3 +3 (21) (4)

= 64 + 252

= 316.

Answer 2

Answer:

316

Explanation: