Definite Integration Question 491

Question: The value of $ \int_1^{5}{(|x-3|+|1-x|)dx} $ is

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Options:

A) 10

B) $ \frac{5}{6} $

C) 21

D) 12

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Answer:

Correct Answer: D

Solution:

$ \int_1^{5}{(|x-3|+|1-x|)dx} $

$ =\int_1^{5}{|x-3|dx+\int_1^{5}{|1-x|}dx} $

$ =\int_1^{3}{-(x-3)dx+\int_3^{5}{(x-3)}dx+}\int_1^{5}{-(1-x)}dx $

$ =12 $ .