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Question
Math
Posted 6 months ago
https://www.chegg.com/homework-help/questions-and-answers/int1-5-f-x-dx-81-int3-5-f-x-dx-57-find-int1-3-f-x-dx--need-help-q128711253
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Answer from Sia
Posted 6 months ago
Solution by Steps
step 1
Given the integrals 15f(x)dx=81\int_{1}^{5} f(x) \, dx = 81 and 35f(x)dx=57\int_{3}^{5} f(x) \, dx = 57, we need to find 13f(x)dx\int_{1}^{3} f(x) \, dx
step 2
We can use the property of definite integrals: abf(x)dx+bcf(x)dx=acf(x)dx\int_{a}^{b} f(x) \, dx + \int_{b}^{c} f(x) \, dx = \int_{a}^{c} f(x) \, dx
step 3
Applying this property, we have 15f(x)dx=13f(x)dx+35f(x)dx\int_{1}^{5} f(x) \, dx = \int_{1}^{3} f(x) \, dx + \int_{3}^{5} f(x) \, dx
step 4
Substitute the given values: 81=13f(x)dx+5781 = \int_{1}^{3} f(x) \, dx + 57
step 5
Solve for 13f(x)dx\int_{1}^{3} f(x) \, dx: 13f(x)dx=8157=24\int_{1}^{3} f(x) \, dx = 81 - 57 = 24
Answer
13f(x)dx=24\int_{1}^{3} f(x) \, dx = 24
Key Concept
Property of Definite Integrals
Explanation
The property of definite integrals allows us to break down or combine integrals over adjacent intervals. By using this property, we can solve for the unknown integral.

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