Question

11. If x/y + y/x = -1 then the
value of x³- y³is -​

Answer 1

Answer:

We will find answer using a property that is (a+b)=a²+b²+2ab

Now,x/y+y/x=(x/y)²+(y/x)²+2xy= -1

x²/y²+y²/x²+2xy= -1

2xy= -1+x²/y²×y²/x²

2xy= -1

xy= -1-2

xy =-3

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