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Fractional Exponents Video Lecture | Quantitative Aptitude (Quant) - CAT

FAQs on Fractional Exponents Video Lecture - Quantitative Aptitude (Quant) - CAT

1. What are fractional exponents and how do they work?
Ans.Fractional exponents are a way to express roots using exponents. An exponent expressed as a fraction, such as \( \frac{m}{n} \), indicates both a power and a root. For example, \( x^{\frac{1}{2}} \) represents the square root of \( x \), and \( x^{\frac{3}{2}} \) means \( \sqrt{x^3} \) or \( (\sqrt{x})^3 \).
2. How do you convert a fractional exponent to a radical form?
Ans.To convert a fractional exponent to radical form, you can use the formula \( x^{\frac{m}{n}} = \sqrt[n]{x^m} \). For instance, \( x^{\frac{3}{4}} \) can be written as \( \sqrt[4]{x^3} \), where 4 is the root and 3 is the power.
3. What are some examples of problems that can be solved using fractional exponents?
Ans.Examples of problems that can be solved using fractional exponents include simplifying expressions like \( 16^{\frac{1}{4}} \), which equals 2, or solving equations such as \( x^{\frac{2}{3}} = 8 \) by rewriting it as \( x^2 = 8^3 \) and solving for \( x \).
4. How do you simplify expressions with fractional exponents?
Ans.To simplify expressions with fractional exponents, you can apply the laws of exponents. For example, to simplify \( x^{\frac{2}{3}} \cdot x^{\frac{1}{3}} \), you add the exponents: \( x^{\frac{2}{3} + \frac{1}{3}} = x^{1} = x \).
5. Can fractional exponents be negative, and what do they represent?
Ans.Yes, fractional exponents can be negative. A negative fractional exponent, such as \( x^{-\frac{m}{n}} \), indicates the reciprocal of the base raised to the corresponding positive fractional exponent. For example, \( x^{-\frac{1}{2}} = \frac{1}{x^{\frac{1}{2}}} = \frac{1}{\sqrt{x}} \).
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