Why Does the Integral of 5 from 0 to 1 Equal 5?

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    Concept Integration
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SUMMARY

The integral of the constant function 5 from 0 to 1 equals 5 because it represents the area under the curve of the function over that interval. Each infinitesimally small section of the area contributes a height of 5 and a width approaching 0, resulting in a total area of 5. This is confirmed by considering the sum of rectangles approximating the area, where the width of each rectangle is 0.1, leading to a total area of 5 when summed over the interval from 0 to 1.

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oneamp
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Will someone please remind me why int from 0 to 1 of 5 equals 5, when the sum of the values 5 at, say 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 is > 5? I lost this fundamental understanding today and want to gain it back.

Thank you
 
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If you go back and think of the integral as an area under the graph, then you see that 5 at 1.1, 1.2, 1.3, ... is always 5, but the boxes are only 0.1 wide, so the area in each of them is only 0.1*5. Add up the 10 boxes and you get the total area which is 5.
 
Ah yes ok thanks.
 

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