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For the following functions \(f,\) find the antiderivative \(F\) that satisfies the given condition. $$f(x)=(4 \sqrt{x}+6 / \sqrt{x}) / x^{2} ; F(1)=4$$

Short Answer

Expert verified
Question: Find the antiderivative \(F(x)\) of the function \(f(x)=\frac{4 \sqrt{x}+6 / \sqrt{x}}{x^{2}}\) given that \(F(1) = 4\). Answer: The antiderivative \(F(x)\) of the given function is \(F(x) = \frac{-8\sqrt{x}-4}{\sqrt{x^3}}+16\).

Step by step solution

01

Rewrite the given function

First, let's rewrite \(f(x)\) to make it easier to find the integral: $$f(x)=\frac{4 \sqrt{x}+6 / \sqrt{x}}{x^{2}}=\frac{4x^{1/2}}{x^2}+\frac{6x^{-1/2}}{x^2}=4x^{-3/2}+6x^{-5/2}$$
02

Find the indefinite integral

Now, we need to find the indefinite integral of \(f(x)\): $$F(x)=\int f(x) dx=\int(4x^{-3/2}+6x^{-5/2}) dx$$ Here, we integrate each term separately using power rule of integration: $$F(x)=4\int x^{-3/2}dx + 6\int x^{-5/2}dx$$
03

Calculate the integrals

Applying the power rule for integration, we get: $$F(x)=4\left[\frac{x^{(-3/2)+1}}{(-3/2)+1}\right] + 6\left[\frac{x^{(-5/2)+1}}{(-5/2)+1}\right]+C$$ Simplifying the expression: $$F(x)=-\frac{8}{x^{1/2}}-\frac{12}{3x^{3/2}}+C$$ $$F(x)=\frac{-8\sqrt{x}-4}{\sqrt{x^3}}+C$$
04

Apply the given condition

We know that \(F(1) = 4\), so let's substitute \(x = 1\) in the above expression of \(F(x)\) to find the constant \(C\): $$4=\frac{-8\sqrt{1}-4}{\sqrt{1^3}}+C$$ $$4=-8-4+C$$ So, \(C=16\).
05

Write the final answer

Now that we've found the constant \(C\), let's write the final answer for the antiderivative \(F(x)\): $$F(x)=\frac{-8\sqrt{x}-4}{\sqrt{x^3}}+16$$

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Power Rule
The Power Rule is a fundamental principle when working with integrals, crucial for calculating antiderivatives easily. This rule states that when you have a function of the form \(x^n\), its antiderivative can be found using the formula:\[\int x^n \, dx = \frac{x^{n+1}}{n+1} + C\]where \(n\) is any real number except \(-1\), and \(C\) is the constant of integration. The Power Rule makes integrating expressions straightforward once you've rewritten them to match the \(x^n\) form.
In our problem, the term \(4x^{-3/2}\) becomes: \[4 \cdot \frac{x^{(-3/2) + 1}}{(-3/2) + 1}\]Calculating within the fraction, you end up with:\[\frac{x^{-1/2}}{-1/2},\]further simplifying gives us:\[-8x^{-1/2} = -8\sqrt{x}\]Apply the Power Rule consistently, step-by-step, to each component when integrating. It's a powerful shortcut, streamlining the path to the solution.
Indefinite Integral
An indefinite integral is essentially the antiderivative of a function. It represents a family of functions and is often expressed with an integrand and a constant of integration, \(C\). When calculating indefinite integrals, you're finding a general form of antiderivatives without set bounds.To compute the indefinite integral of \(f(x)\), you integrate all parts of \(f(x)\) separately:\[\int(4x^{-3/2} + 6x^{-5/2}) \text{d}x\]Each term is approached individually:
  • \(4 \cdot \int x^{-3/2}\text{d}x\)
  • \(6 \cdot \int x^{-5/2}\text{d}x\)
This process helps ensure clarity and structure in your computations. Indefinite integrals allow flexibility in exploring potential solutions, given the constant \(C\) which adjusts based on any additional conditions provided, like \(F(1) = 4\).As you integrate, you're reversing differentiation, returning to the function that, when derived, gives the original \(f(x)\). The indefinite integral is thus foundational in calculus.
Constant of Integration
The Constant of Integration, denoted as \(C\), arises whenever you deal with indefinite integrals. Since differentiation erases constant terms, integrating does not recover them; \(C\) accounts for any such omissions. It's what transforms the indefinite integral from a single path back to a family of functions.When tasked with finding a specific antiderivative, extra information is crucial. Given \(F(1)=4\), this condition lets you pinpoint \(C\) precisely for your function:To do this, substitute the given \(x\) value into the expression already obtained from the indefinite integral:\[F(x) = \frac{-8\sqrt{x} - 4}{\sqrt{x^3}} + C\]Setting \(x = 1\), you need:\[4 = \frac{-8\cdot\sqrt{1} - 4}{\sqrt{1^3}} + C\]Solving this equation, you find \(C = 16\). This specific \(C\) ties the particular solution directly to the provided condition.In encompassing the entire spectrum of possible integral outcomes, the constant of integration plays a pivotal role, ensuring that all bases are covered in indefinite integrals.

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Most popular questions from this chapter

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