The problem is to evaluate the indefinite integral of the function $\sqrt{x} - \frac{1}{2}x + \frac{2}{\sqrt{x}}$ with respect to $x$. In other words, we want to find $\int (\sqrt{x} - \frac{1}{2}x + \frac{2}{\sqrt{x}}) dx$.

AnalysisIntegrationIndefinite IntegralPower RuleCalculus
2025/4/27

1. Problem Description

The problem is to evaluate the indefinite integral of the function x12x+2x\sqrt{x} - \frac{1}{2}x + \frac{2}{\sqrt{x}} with respect to xx. In other words, we want to find (x12x+2x)dx\int (\sqrt{x} - \frac{1}{2}x + \frac{2}{\sqrt{x}}) dx.

2. Solution Steps

First, rewrite the terms in the integrand using exponents:
(x12x+2x)dx=(x1/212x+2x1/2)dx\int (\sqrt{x} - \frac{1}{2}x + \frac{2}{\sqrt{x}}) dx = \int (x^{1/2} - \frac{1}{2}x + 2x^{-1/2}) dx.
Now, we apply the power rule for integration to each term. The power rule states that xndx=xn+1n+1+C\int x^n dx = \frac{x^{n+1}}{n+1} + C, where n1n \neq -1.
Applying the power rule to each term, we get:
x1/2dx=x1/2+11/2+1=x3/23/2=23x3/2\int x^{1/2} dx = \frac{x^{1/2 + 1}}{1/2 + 1} = \frac{x^{3/2}}{3/2} = \frac{2}{3}x^{3/2}
12xdx=12x1dx=12x1+11+1=12x22=14x2\int -\frac{1}{2}x dx = -\frac{1}{2} \int x^1 dx = -\frac{1}{2} \frac{x^{1+1}}{1+1} = -\frac{1}{2} \frac{x^2}{2} = -\frac{1}{4}x^2
2x1/2dx=2x1/2dx=2x1/2+11/2+1=2x1/21/2=22x1/2=4x1/2\int 2x^{-1/2} dx = 2 \int x^{-1/2} dx = 2 \frac{x^{-1/2 + 1}}{-1/2 + 1} = 2 \frac{x^{1/2}}{1/2} = 2 \cdot 2 x^{1/2} = 4x^{1/2}
Adding the results and the constant of integration CC, we have:
(x1/212x+2x1/2)dx=23x3/214x2+4x1/2+C\int (x^{1/2} - \frac{1}{2}x + 2x^{-1/2}) dx = \frac{2}{3}x^{3/2} - \frac{1}{4}x^2 + 4x^{1/2} + C
We can rewrite this in terms of square roots:
23x3/214x2+4x1/2+C=23xx14x2+4x+C\frac{2}{3}x^{3/2} - \frac{1}{4}x^2 + 4x^{1/2} + C = \frac{2}{3}x\sqrt{x} - \frac{1}{4}x^2 + 4\sqrt{x} + C.

3. Final Answer

23xx14x2+4x+C\frac{2}{3}x\sqrt{x} - \frac{1}{4}x^2 + 4\sqrt{x} + C

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