Question

11. If 3x – 2y = 11 and xy = 12, find the value of 27 x3 – 8y3
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Answer 1

Answer:

3x-3y=11.........1

xy=12

x=12/y.......2

substitute 1 and 2

36/y-3y=11

36-3y=11y

14y=36

y=18/7

x=14/3(substitute y with equation 2 to get x)

27(14/3)^3-8(18/7)^3

2607.97 is the answer(after simplification)