What does it mean to write an integral in its explicit form? The first part of Fundamental Theorem

dglennuo

dglennuo

Answered question

2022-05-27

What does it mean to write an integral in its explicit form?
The first part of Fundamental Theorem of Calculus gives an abstract way of producing antiderivatives:
Write F ( x ) = 1 x ( t + 1 ) d t in an explicit form. Check that its derivative is indeed x + 1.
What does it mean to find an integral in it explicit form? Does it mean to find its anti derivative?

Answer & Explanation

Dominique Holmes

Dominique Holmes

Beginner2022-05-28Added 10 answers

Step 1
Here you have a "definite integral" with a variable in one of the limits, so you need to find the antiderivative and actually substitute the limits into it. The general antiderivative is F ( t ) = t 2 / 2 + t + C so when you substitute the limits you get x 2 / 2 + x 3 / 2.
Step 2
Edit: Since the general antiderivative is F ( t ) = t 2 / 2 + t + C, you find your integral by substituting in the limits.
That is, 1 x ( t + 1 ) d t = F ( x ) F ( 1 ) = x 2 / 2 + x + C ( 3 / 2 + C ) = x 2 / 2 + x 3 / 2..
This is not really any different than you would do if the upper limit were 2 or 4/3, except that the result depends on the variable x.

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