MCQ
Integrate the following functions with respect to $x : \int\frac{\text{dx}}{4\text{x}+5}$
  • $\frac{1}{4}\text{ In }(4\text{x}+5)+\text{c}$
  • B
    $\frac{1}{4}\text{ In }(4\text{x}+5)-\text{c}$
  • C
    $\frac{-1}{4}\text{ In }(4\text{x}+5)-\text{c}$
  • D
    $4\text{ In }(4\text{x}-5)-\text{c}$

Answer

Correct option: A.
$\frac{1}{4}\text{ In }(4\text{x}+5)+\text{c}$
$\int\frac{\text{dx}}{4\text{x}+5}=\frac{1}{4}\int\frac{\text{dx}}{\text{x}}$ where $x = 4x + 5$
$=\frac{1}{4}\text{ In }\text{x}+\text{c}_{1}=\frac{1}{4}\text{ In }(4\text{x}+5)+\text{c}_{2}$

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