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Mathematics

If log10 x = a, the value of 10a - 1 in terms of x is :

  1. 10x

  2. x10\dfrac{x}{10}

  3. 10x\dfrac{10}{x}

  4. 110x\dfrac{1}{10x}

Logarithms

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Answer

Given,

⇒ log10 x = a

⇒ x = 10a …….(1)

We need to find the value of:

⇒ 10a - 1

⇒ 10a.10-1

Substituting value of 10a from equation (1), in above equation, we get :

⇒ x.10-1

⇒ x10\dfrac{x}{10}.

Hence, Option 2 is the correct option.

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