Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Indefinite Integration

Question:

Find the integral: $\displaystyle \int \frac{dx}{x^2 - 16}$

Options:

$\frac{1}{8} \log \left| \frac{x + 4}{x + 3} \right| + C$

$\frac{5}{8} \log \left| \frac{x - 4}{x + 4} \right| + C$

$\frac{1}{8} \log \left| \frac{x - 4}{x + 4} \right| + C$

$\frac{3}{8} \log \left| \frac{x - 4}{x + 4} \right| + C$

Correct Answer:

$\frac{1}{8} \log \left| \frac{x - 4}{x + 4} \right| + C$

Explanation:

The correct answer is Option (3) → $\frac{1}{8} \log \left| \frac{x - 4}{x + 4} \right| + C$

We have $\int \frac{dx}{x^2 - 16} = \int \frac{dx}{x^2 - 4^2}$

$= \frac{1}{8} \log \left| \frac{x - 4}{x + 4} \right| + C$