Evaluate the integrals in Exercises 39–54.
∫ 1 / (x√x + 9) dx

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Rewrite the integral to clarify the expression inside the square root: the integral is \(\int \frac{1}{x \sqrt{x + 9}} \, dx\).

Use a substitution to simplify the square root term. Let \(u = x + 9\), so that \(du = dx\) and \(x = u - 9\).

Rewrite the integral in terms of \(u\): replace \(x\) with \(u - 9\) and \(dx\) with \(du\), so the integral becomes \(\int \frac{1}{(u - 9) \sqrt{u}} \, du\).

Express the integrand as \(\frac{1}{(u - 9) u^{1/2}} = \frac{1}{u^{1/2} (u - 9)}\) and consider using partial fraction decomposition or another substitution to simplify this expression further.

Set up the partial fraction decomposition or an appropriate substitution to break down the integrand into simpler terms that can be integrated individually.

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주요 개념

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Integration Techniques

Integration techniques are methods used to find antiderivatives or evaluate integrals. Common techniques include substitution, integration by parts, and partial fractions. Choosing the right technique depends on the form of the integrand, such as recognizing when a substitution simplifies the integral.

Substitution Method

The substitution method involves changing variables to simplify an integral. By letting a new variable equal a function inside the integral, the integral can often be rewritten in a simpler form. This is especially useful when the integrand contains composite functions or expressions under roots.

Handling Radicals in Integrals

Integrals involving radicals, such as square roots, often require algebraic manipulation or substitution to simplify the expression. Recognizing how to rewrite radicals and expressions like √(x + 9) can help transform the integral into a more manageable form for evaluation.

Evaluate the integrals in Exercises 39–54.∫ 1 / (x√x + 9) dx