Any help will be appreciated assuming a pretty easy integral

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In summary, the conversation is about finding the integral of a function, f(t), with limits of [0, 1] equal to 9. The task is to find the integrals of two different functions, 10t and 1-10t, with limits of [0, 0.1]. The conversation discusses using a u-substitution and determining the u-limits for the integrals.
  • #1
IntegrateMe
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Any help will be appreciated...assuming a pretty easy integral...

∫f(t) dt = 9 [0, 1]

Find:

∫f(10t)dt [0, 0.1]
∫f(1 - 10t)dt [0, 0.1]

Any idea on how to get started with this one?
 
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  • #2


IntegrateMe said:
∫f(t) dt = 9 [0, 1]

Find:

∫f(10t)dt [0, 0.1]
∫f(1 - 10t)dt [0, 0.1]

Any idea on how to get started with this one?

Change variables with a u-substitution. For the first one try u=10t. What is du?
 
  • #3


10dt!
 
  • #4


IntegrateMe said:
10dt!

Ok, so change the t integral to a u integral.
 
  • #5


1/10∫f(u)du ?
 
  • #6


IntegrateMe said:
1/10∫f(u)du ?

Looks good so far. And what are the u limits? The t limits were [0,0.1].
 
  • #7


From 0 to 0.1.

Does ∫f(u)du = 9?
 
  • #8


IntegrateMe said:
From 0 to 0.1.

Does ∫f(u)du = 9?

It won't be 9, if the u limits are 0 to 0.1. But they aren't. If t=0.1, what's the corresponding u?
 

What is an integral?

An integral is a mathematical concept that represents the accumulation of a continuous quantity over an interval. It is used to find the total area under a curve or the total volume of a solid shape.

Why is finding the integral important?

Finding the integral is important in many areas of mathematics and science, as it allows us to solve problems involving continuous quantities. It also has practical applications in fields such as physics, engineering, and economics.

What makes an integral easy?

An integral is considered easy when it has a straightforward mathematical solution or when it can be solved using well-known integration techniques. This often depends on the complexity of the integrand (the function being integrated).

How can I solve an easy integral?

To solve an easy integral, you can follow the standard integration rules and techniques, such as substitution, integration by parts, or using simple integration formulas. It is also helpful to have a good understanding of basic algebra and trigonometry.

Is there a way to check my answer after solving an easy integral?

Yes, there are various ways to check your answer after solving an easy integral. You can use a graphing calculator to graph the integrand and compare it to the graph of your solution. Additionally, you can take the derivative of your solution to see if it matches the original integrand.

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