Area between two curves problem

In summary, the task is to find the area enclosed by the functions y = e^x, y = 2, and the y-axis. The approach is to use the formula for finding the area between a curve and the y-axis, which is given by ∫ x dy. The lower bound for x is determined by the y-axis, and the upper bound is the intersection of the given functions. In this case, the upper bound is found by setting y = e^x = 2 and solving for x. The definite integral is then evaluated to find the area, which is equal to 4ln(4) - 4.
  • #1
zeezey
11
0

Homework Statement


Find the area of the indicated region.
Enclosed by y = e^x, y = 2, and the y-axis

The Attempt at a Solution



So I the area should be integral of e^x - 2 which = e^x - 2x . I'm not sure what to do with the y-axis it mentions?
 
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  • #2
zeezey said:

The Attempt at a Solution



So I the area should be integral of e^x - 2 which = e^x - 2x . I'm not sure what to do with the y-axis it mentions?


Firstly where does y=ex cut the y-axis?

You should then know the area between a curve and the y-axis is given by ∫ x dy. So if y=ex, how do you put x in terms of y?
 
  • #3
umm I'm not sure you mean like dx = e^x dy ?
 
  • #4
So you have e^x-2 as the integrand, as you mentioned. The mention of the y-axis is to put a lower bound on x (in this case, evaluating your integral from a-to-b by the FTC, the lower bound, a, is x=0)...then the upper bound would be the intersection of the functions. It's always helpful to draw out what you're asked for.

I'll leave it to you to find the upper bound and then evaluate your now definite integral.
 
  • #5
So I got 4ln(4) - 4 . Is this correct?
 

FAQ: Area between two curves problem

What is the "area between two curves problem"?

The "area between two curves problem" is a mathematical concept that involves finding the area between two curves on a graph. This problem is typically encountered in calculus, and it requires the use of integration to find the area between the curves.

How do you solve the "area between two curves problem"?

To solve the "area between two curves problem", you must first identify the two curves and the interval over which you want to find the area. Then, you can use the integration formula to find the area between the curves. This involves finding the antiderivative of the difference between the two curves and evaluating it at the upper and lower bounds of the interval.

What are some real-life applications of the "area between two curves problem"?

The "area between two curves problem" has many real-life applications in fields such as engineering, physics, and economics. For example, it can be used to calculate the area under a velocity-time graph to determine the displacement of an object, or to find the profit or loss between two different business strategies.

Are there any special cases or exceptions to consider when solving the "area between two curves problem"?

Yes, there are several special cases to consider when solving the "area between two curves problem". One common exception is when the two curves intersect multiple times within the given interval. In this case, you would need to break up the interval into smaller intervals and calculate the area separately for each interval.

What are some tips for solving the "area between two curves problem" efficiently?

One helpful tip for solving the "area between two curves problem" efficiently is to carefully sketch the two curves on a graph to visually understand the problem. This can also help you identify any special cases or exceptions that may arise. Additionally, it is important to pay attention to the bounds of the interval and double check your work to ensure accuracy.

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