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Sagot :
Sure! Let's evaluate the definite integral of the function
[tex]\[ \int_1^{25} \sqrt{\frac{7}{x}} \, dx \][/tex]
Step-by-step:
1. Understand the integrand: The function we want to integrate is [tex]\(\sqrt{\frac{7}{x}}\)[/tex].
2. Simplify the integrand: Notice that [tex]\(\sqrt{\frac{7}{x}}\)[/tex] can be written as
[tex]\[ \sqrt{7} \cdot \frac{1}{\sqrt{x}} = \sqrt{7} \cdot x^{-\frac{1}{2}}. \][/tex]
3. Set up the integral:
[tex]\[ \int_1^{25} \sqrt{7} \cdot x^{-\frac{1}{2}} \, dx. \][/tex]
4. Factor out the constant: The constant [tex]\(\sqrt{7}\)[/tex] can be factored out of the integral:
[tex]\[ \sqrt{7} \int_1^{25} x^{-\frac{1}{2}} \, dx. \][/tex]
5. Integrate the power of [tex]\(x\)[/tex]:
[tex]\[ \int x^{-\frac{1}{2}} \, dx. \][/tex]
Using the power rule for integration, which states [tex]\(\int x^n \, dx = \frac{x^{n+1}}{n+1} + C\)[/tex] for [tex]\(n \neq -1\)[/tex], we get:
[tex]\[ \int x^{-\frac{1}{2}} \, dx = \frac{x^{-\frac{1}{2} + 1}}{-\frac{1}{2} + 1} + C = \frac{x^{\frac{1}{2}}}{\frac{1}{2}} + C = 2x^{\frac{1}{2}} + C. \][/tex]
6. Evaluate the definite integral: Substituting back, we have
[tex]\[ \sqrt{7} \int_1^{25} x^{-\frac{1}{2}} \, dx = \sqrt{7} \left[ 2x^{\frac{1}{2}} \right]_1^{25}. \][/tex]
This evaluates to:
[tex]\[ \sqrt{7} \left[ 2 \sqrt{x} \right]_1^{25}. \][/tex]
7. Apply the limits of integration:
[tex]\[ \sqrt{7} \left[ 2 \sqrt{25} - 2 \sqrt{1} \right] = \sqrt{7} \left[ 2 \cdot 5 - 2 \cdot 1 \right] = \sqrt{7} \left[ 10 - 2 \right] = \sqrt{7} \cdot 8 = 8\sqrt{7}. \][/tex]
8. Numerical value: To find the numerical value, we calculate [tex]\(8\sqrt{7}\)[/tex]:
[tex]\[ 8\sqrt{7} \approx 21.16601048851688. \][/tex]
Therefore, the value of the definite integral is approximately [tex]\(21.16601048851688\)[/tex].
To verify this result, one could use a graphing utility to plot the function [tex]\(\sqrt{7/x}\)[/tex], shade the region under the curve from [tex]\(x = 1\)[/tex] to [tex]\(x = 25\)[/tex], and calculate the area. The numerical result from such a utility will confirm that the integral evaluates to approximately [tex]\(21.16601048851688\)[/tex]. The small error margin [tex]\(\approx 1.59 \times 10^{-7}\)[/tex] indicates very high accuracy of the numerical integration.
So, the definite integral of [tex]\(\sqrt{\frac{7}{x}}\)[/tex] from [tex]\(1\)[/tex] to [tex]\(25\)[/tex] is indeed [tex]\(21.16601048851688\)[/tex].
[tex]\[ \int_1^{25} \sqrt{\frac{7}{x}} \, dx \][/tex]
Step-by-step:
1. Understand the integrand: The function we want to integrate is [tex]\(\sqrt{\frac{7}{x}}\)[/tex].
2. Simplify the integrand: Notice that [tex]\(\sqrt{\frac{7}{x}}\)[/tex] can be written as
[tex]\[ \sqrt{7} \cdot \frac{1}{\sqrt{x}} = \sqrt{7} \cdot x^{-\frac{1}{2}}. \][/tex]
3. Set up the integral:
[tex]\[ \int_1^{25} \sqrt{7} \cdot x^{-\frac{1}{2}} \, dx. \][/tex]
4. Factor out the constant: The constant [tex]\(\sqrt{7}\)[/tex] can be factored out of the integral:
[tex]\[ \sqrt{7} \int_1^{25} x^{-\frac{1}{2}} \, dx. \][/tex]
5. Integrate the power of [tex]\(x\)[/tex]:
[tex]\[ \int x^{-\frac{1}{2}} \, dx. \][/tex]
Using the power rule for integration, which states [tex]\(\int x^n \, dx = \frac{x^{n+1}}{n+1} + C\)[/tex] for [tex]\(n \neq -1\)[/tex], we get:
[tex]\[ \int x^{-\frac{1}{2}} \, dx = \frac{x^{-\frac{1}{2} + 1}}{-\frac{1}{2} + 1} + C = \frac{x^{\frac{1}{2}}}{\frac{1}{2}} + C = 2x^{\frac{1}{2}} + C. \][/tex]
6. Evaluate the definite integral: Substituting back, we have
[tex]\[ \sqrt{7} \int_1^{25} x^{-\frac{1}{2}} \, dx = \sqrt{7} \left[ 2x^{\frac{1}{2}} \right]_1^{25}. \][/tex]
This evaluates to:
[tex]\[ \sqrt{7} \left[ 2 \sqrt{x} \right]_1^{25}. \][/tex]
7. Apply the limits of integration:
[tex]\[ \sqrt{7} \left[ 2 \sqrt{25} - 2 \sqrt{1} \right] = \sqrt{7} \left[ 2 \cdot 5 - 2 \cdot 1 \right] = \sqrt{7} \left[ 10 - 2 \right] = \sqrt{7} \cdot 8 = 8\sqrt{7}. \][/tex]
8. Numerical value: To find the numerical value, we calculate [tex]\(8\sqrt{7}\)[/tex]:
[tex]\[ 8\sqrt{7} \approx 21.16601048851688. \][/tex]
Therefore, the value of the definite integral is approximately [tex]\(21.16601048851688\)[/tex].
To verify this result, one could use a graphing utility to plot the function [tex]\(\sqrt{7/x}\)[/tex], shade the region under the curve from [tex]\(x = 1\)[/tex] to [tex]\(x = 25\)[/tex], and calculate the area. The numerical result from such a utility will confirm that the integral evaluates to approximately [tex]\(21.16601048851688\)[/tex]. The small error margin [tex]\(\approx 1.59 \times 10^{-7}\)[/tex] indicates very high accuracy of the numerical integration.
So, the definite integral of [tex]\(\sqrt{\frac{7}{x}}\)[/tex] from [tex]\(1\)[/tex] to [tex]\(25\)[/tex] is indeed [tex]\(21.16601048851688\)[/tex].
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