if x/y+y/x=-1(xy is not equals to 0) find the value of x^3-y^3
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Step-by-step explanation:
If x/y + y/x = -1 (x, y are not equal to zero), then what is x^3-y^3 equal to?
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First, we note that
x3−y3=(x−y)(x2+xy+y2)
Now, if xy+yx=−1 , then, by getting a common denominator, we find that
x2+y2xy=−1
Multiply through by xy :
x2+y2=−xy
bring all terms to the left:
x2+xy+y2=0
Hence,
x3−y3=(x−y)(x2+xy+y2)=(x−y)⋅0=0
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