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# Use the properties of integrals and the result of Example 3 to evaluate $\displaystyle \int^3_1 (2e^x - 1) \, dx$.

## $\int_{1}^{3}\left(2 e^{x}-1\right) d x=2\left(e^{3}-e-1\right) \approx 32.73$

Integrals

Integration

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##### Catherine R.

Missouri State University

##### Kristen K.

University of Michigan - Ann Arbor

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### Video Transcript

Yeah problem. 44. They want us to evaluate using properties of integral roles. The integral 1 to 3 to eat of the X men is one given that in a previous exercise. A few pages before this they work through an example and found this result. So properties of integral is here. This is going to be the integral from 1 to 3 of two. E to the X D x minus. The integral from 1 to 3 D X. That is to times the integral from 1 to 3. Either the X D x minus. The integral from 1 to 3 D X. Now the result that you see here, I already know that value so I can substitute that in. So this is going to be yeah, two. Mhm E cubed minus E minus. And this is just going to be three minus one. So when you do that integral is going to be So 3 -1. The reason you see this is, what does that function look like? This is like, well, one if y is equal to one from 1 to 3. Yeah, so here's one, here's one, here's three. What is the area of this rectangle? That is a one by three rectangle? Excuse me? one x 1 x two Rectangle. So it turns out this is just simply two E cubed minus E -2. Or if you factor to out of everything, EQ -E -1 is the final answer there.