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MathNet 2022-part-05 — 197 problems (EN–VI) Question 12

Math Olympiad Vault · MathNet 2022-part-05 — 197 problems (EN–VI)

Question 12

The expression $\frac{x^{n-1}}{x^{n}-2 x^{n-1}}-\frac{x^{n}}{x^{n+1}-4 x^{n-1}}$ is given. Which expression is equivalent to it for $x \neq 0$?

(A) $\frac{1}{(x-2)}$

(B) $\frac{2}{(x-2)(x+2)}$

(C) $\frac{1}{(x+2)}$

(D) $\frac{2 x}{(x-2)(x+2)}$

(E) $\frac{1-x}{(x-2)(x+2)}$