Question

Pls answer and solve the question no. 8 in detail.This question carries 20 marks.

Answer 1

Answer: Option(C) - 0

Explanation:

$Given : \frac{x}{y} + \frac{y}{x} = -1$

$= \ \textgreater \ \frac{x^2 + y^2}{xy} = -1$

= > x^2 + y^2 = -xy

= > x^2 + y^2 + xy = 0.


Now,

We know that a^3 - b^3 = (a - b)(a^2 + ab + b^2) .

Given:

x^3 - y^3 = (x - y)(x^2 + xy + y^2)

                = (x - y)(0)

                = 0.


Therefore x^3 - y^3 = 0.


Hope this helps!

Answer 2

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