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  • Help me please, Which of the following is a perfect way to write an integral?

Which of the following is a perfect way to write an integral?

  • Option 1)

    \int_{1}^{3}f(x)

  • Option 2)

    \int_{5}^{8}f(x)dy

  • Option 3)

    \int_{7}^{9}f(x)dx

  • Option 4)

    \int_{7}^{5}f(x)dx

 

Answers (1)

best_answer

As we have learnt,

 

Definite integration -

When f\left ( x \right ) is integrated in a continuous limit, \left ( a,b \right ): a, b are known as limit of integration.

 

- wherein

Where a < x < b

 

 

In (A), dx is not written.

In (B), the variables are not same.

In (D), the lower variable is greater than the upper variable.


Option 1)

\int_{1}^{3}f(x)

Option 2)

\int_{5}^{8}f(x)dy

Option 3)

\int_{7}^{9}f(x)dx

Option 4)

\int_{7}^{5}f(x)dx

Posted by

gaurav

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