What is the Antiderivative of 5\sqrt{}x?

In summary, the conversation discusses finding the antiderivative for 5\sqrt{x} and using the power rule for integrals. The problem of evaluating the definite integral \int^{7}_{1} 5/\sqrt{}x is also mentioned, with the suggestion to use the power rule for integrals on x^{-\frac{1}{2}}.
  • #1
jimen113
67
0

Homework Statement



the antiderivative for 5[tex]\sqrt{}x[/tex]

Homework Equations





The Attempt at a Solution



It almost looks like the derivative of the function [tex]\sqrt{}x[/tex]
 
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  • #2
[tex]\int 5\sqrt{x} = \int 5x^{1/2}[/tex]

So just use the power rule for integrals.
 
  • #3
revised

the actual problem is:
Evaluate the definite integral [tex]\int^{7}_{1}[/tex] 5/[tex]\sqrt{}x[/tex]
using the power rule I got:
5[(x^3/2)/(3/2)] evaluating them at the end points 1 and 7, the answer I get after using FTC II is:-58.400 and is incorrect.
What am I doing wrong? please help
 
  • #4
Do you mean [tex]\int_1^7 \frac{5}{\sqrt{x}} \ dx[/tex]?

If so, then x^(3/2) shouldn't be part of your answer.
 
  • #5
Defennnder said:
Do you mean [tex]\int_1^7 \frac{5}{\sqrt{x}} \ dx[/tex]?

If so, then x^(3/2) shouldn't be part of your answer.
Yes (to part one)
then how should I find the antiderivative? for 5/[tex]\sqrt{}x[/tex]
 
  • #6
You must first find the antiderivate for [tex]x^{-\frac{1}{2}}[/tex]. Use the power rule for integrals as Feldoh said.
 
  • #7
Thanks for your help!
 

What is a derivative?

A derivative of a function represents the rate of change of that function at a specific point. In other words, it is the slope of the tangent line to the function at that point.

Why is the derivative important?

The derivative is important because it helps us understand the behavior and characteristics of a function. It can tell us whether a function is increasing or decreasing, at what rate, and can also help us find maximum and minimum values.

How do I find the derivative of a function?

The derivative of a function can be found by using a specific formula or by using rules such as the power rule, product rule, quotient rule, and chain rule. These rules involve taking the derivative of each term in the function and combining them using specific operations.

What is the difference between a derivative and an antiderivative?

A derivative and an antiderivative are related but have different meanings. A derivative represents the rate of change of a function at a specific point, while an antiderivative is the reverse process of finding a function whose derivative is equal to the original function.

Can the derivative of a function be negative?

Yes, the derivative of a function can be negative. This means that the function is decreasing at that point. The sign of the derivative can tell us about the direction of the function's slope at that point.

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