Question

if 3x-4y = 1/2 and xy=1/8, then find the value of 27x³-64y³​

Answer 1

Answer:

The answer is 19/8.

Step-by-step explanation:

(3x -4y)³= (3x)³ - (4y)³ - 3*3x*4y(3x-4y)

(1/2)³ = 27x³ - 64y³ -36/8*1/2

1/8 = 27x³ - 64y³ -9/4

27x³ - 64y³ = 1/8 + 9/4

(1+ 18)/8

= 19/8

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