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If \(a>0\), \(a\ne1\), and \(\frac{a^{3p-2}\cdot a^{p+5}}{a^{2p-1}}=a^{10}\) holds for all such values of \(a\), what is the value of \(p\)?

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Answer and explanation

Correct answer: 3

By the laws of exponents, exponents are added when like bases are multiplied and subtracted when they are divided. Thus, the exponent on the left side is \((3p-2)+(p+5)-(2p-1)=2p+4\). Therefore, \(2p+4=10\), giving \(2p=6\) and hence \(p=3\). Option C can result from mishandling the subtraction of the denominator’s exponent. In an exam, remember to change the sign of the exponent in the denominator while simplifying.

Related tags

Laws Of ExponentsExponent EquationsPolynomialsClass 10 Mathematics

Frequently asked questions

What is the correct answer to this question?

3

Why is this the correct answer?

By the laws of exponents, exponents are added when like bases are multiplied and subtracted when they are divided. Thus, the exponent on the left side is \((3p-2)+(p+5)-(2p-1)=2p+4\). Therefore, \(2p+4=10\), giving \(2p=6\) and hence \(p=3\). Option C can result from mishandling the subtraction of the denominator’s exponent. In an exam, remember to change the sign of the exponent in the denominator while simplifying.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Polynomials. Topic: Operations on real numbers and the laws of exponents.

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