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QUESTION

How do you evaluate the integral of absolute value of (x - 5) from 0 to 10 by finding area?

Using integrals:

Since the |x-5| is equal to a positive value when x ranges from 5 to 10 but equal to a negative value from 0 to 5, we have to split the integral into two parts. Notice in the previous answer how the graph creates two triangles.

Here's what we have: ##int_0^5- (x-5) dx## + ##int_5^10 (x-5) dx##

When you integrate using your you obtain: ##-1/2 x^2 + 5x## from 0 to 5 + ##1/2 x^2 - 5x## from 5 to 10.

Substituting upper bound minus lower bound for the first integral results in ##[-1/2(25)+5(5)] - [-1/2 (0) +5(0)]## which equals ##25/2##.

Doing the same for the second integral gives us ##[1/2(100)-5(10)] - [1/2(25)-5(5)]## which equals ##25/2##.

Add the two integral values for the total area: ##25/2+25/2=25##

Hope this helps.

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