Differentiate from first principles

  • Thread starter Thread starter auru
  • Start date Start date
  • Tags Tags
    Differentiate
Click For Summary
SUMMARY

The discussion focuses on differentiating the function f(x) = (x+1)^(1/2) from first principles using the limit definition of the derivative. The key equation utilized is f'(x) = Lim h→0 [(f(x+h) - f(x))/h]. The simplification process involves applying the identity (x-a)(x+a) = x^2 - a^2 to facilitate the limit calculation. The participant successfully completed the differentiation after applying these principles.

PREREQUISITES
  • Understanding of calculus, specifically limits and derivatives.
  • Familiarity with the limit definition of a derivative.
  • Knowledge of algebraic identities, particularly (x-a)(x+a) = x^2 - a^2.
  • Basic skills in manipulating expressions involving square roots.
NEXT STEPS
  • Study the concept of limits in calculus, focusing on epsilon-delta definitions.
  • Learn advanced differentiation techniques, including the product and quotient rules.
  • Explore the application of derivatives in real-world problems, such as optimization.
  • Practice differentiating more complex functions using first principles.
USEFUL FOR

Students studying calculus, educators teaching differentiation methods, and anyone seeking to strengthen their understanding of limits and derivatives in mathematical analysis.

auru
Messages
10
Reaction score
0

Homework Statement



Differentiate (x+1)^1/2 from first principles with respect to x.

Homework Equations



f'(x) = Lim h→0 [f(x+h) - f(x)]/h

The Attempt at a Solution



f'(x) = Lim h→0 [f(x+h) - f(x)]/h
f'(x) = Lim h→0 [(x+h+1)^1/2 - (x+1)^1/2]/h

I'm unsure how to simplify from there.
 
Physics news on Phys.org
Use the equality

(x-a)(x+a)=x^2 - a^2

to simplify the limit.
 
Simplify the fraction, let h go to zero and you're done.
 
I've done it now, thanks!
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
15
Views
2K
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K