Question

if x/y + y/x = -1 (x, y is not equal to 0) the value of x^3 - y^3 is:
(a) 1
(b) -1
(c) 0
(d) 1/2​

Answer 1

Answer:

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Answer 2

Answer:

(c) 0

Step-by-step explanation:

x/y + y/x = -1

Taking Lcm

x²+y². = -1

xy

x² + y² = -xy

now x³-y³ = (x-y)(x²+y²+xy)

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

=(x-y) * 0

x³-y³ = 0