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What is obtained by simplifying \(\frac{x^5-x}{x}\) for \(x\neq0\)?

Answer and explanation

Correct answer: \(x^4-1\)

The direct answer is A, \(x^4-1\). The restriction \(x\neq0\) is important because division by zero is not allowed. For nonzero x, divide each term in the numerator by x: \(\frac{x^5}{x}=x^{5-1}=x^4\), and \(\frac{x}{x}=1\). Thus \(\frac{x^5-x}{x}=x^4-1\). Option A is correct. Option B, \(x^5-1\), fails because the first term must lose one power of x after division. Option C, \(x^4-x\), incorrectly leaves an x in the second term; \(x/x=1\), not x. Option D, \(x^3-1\), removes two powers from the first term instead of one. The simplified expression is valid only for the stated domain \(x\neq0\); the original expression itself is undefined at zero. Memory cue: when dividing powers with the same nonzero base, subtract exponents: \(x^m/x=x^{m-1}\).

Related tags

PolynomialRational SimplificationDomain

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