Class 9 Mathematics - Introduction to Polynomials - Algebraic expressions Expert Quiz

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\(\frac{x^4-3x^2}{x^2}\) को \(x\neq0\) पर सरल करने के बाद कौन-सा रूप मिलेगा?

After simplifying \(\frac{x^4-3x^2}{x^2}\) for \(x\neq0\), which form is obtained?

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Correct Answer

A. \(x^2-3\)

Explanation

Simple Explanation

अंश के दोनों पदों को \(x^2\) से भाग देते हैं: \(\frac{x^4}{x^2}-\frac{3x^2}{x^2}=x^{4-2}-3x^{2-2}=x^2-3\)। इसलिए सही उत्तर \(x^2-3\) है। विकल्प B में दूसरे पद का भाग गलत है, क्योंकि \(\frac{3x^2}{x^2}=3\), \(\frac{3}{x^2}\) नहीं। यह सरलीकरण केवल \(x\neq0\) के लिए मान्य है, क्योंकि मूल व्यंजक में \(x=0\) पर हर शून्य हो जाता है। परीक्षा टिप: समान आधार वाली घातों को भाग देते समय घातांक घटाएँ। / Divide both terms of the numerator by \(x^2\): \(\frac{x^4}{x^2}-\frac{3x^2}{x^2}=x^{4-2}-3x^{2-2}=x^2-3\). Therefore, \(x^2-3\) is the correct answer. Option B incorrectly divides the second term, since \(\frac{3x^2}{x^2}=3\), not \(\frac{3}{x^2}\). The simplification is valid only for \(x\neq0\), as the original expression is undefined at \(x=0\). Exam tip: when dividing powers with the same base, subtract the exponents.

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