Intervals of Increase and Decrease for e^x = e^-2x

  • Thread starter Thread starter erik05
  • Start date Start date
  • Tags Tags
    Calculus
Click For Summary
SUMMARY

The discussion focuses on finding the intervals of increase and decrease for the equation y = e^x = e^-2x. The first derivative is correctly identified as y' = e^x - 2e^-2x, which is set to zero to find critical points. The solution involves applying logarithmic properties, specifically using the natural logarithm to simplify the equation to (e^x)^3 = 2. The critical point is determined to be x = (ln 2)/3.

PREREQUISITES
  • Understanding of derivatives and critical points in calculus
  • Familiarity with exponential functions and their properties
  • Knowledge of logarithmic functions, particularly natural logarithms
  • Ability to manipulate algebraic equations and fractions
NEXT STEPS
  • Study the properties of exponential functions and their derivatives
  • Learn how to apply the natural logarithm in solving equations
  • Explore techniques for finding intervals of increase and decrease in functions
  • Practice solving similar problems involving derivatives and critical points
USEFUL FOR

Students studying calculus, mathematics educators, and anyone interested in understanding the behavior of exponential functions and their derivatives.

erik05
Messages
50
Reaction score
0
Hello all. Really quick question here...What are the intervals of increase and decrease for y= e^x = e^-2x. I found the first derivative : y'= e^x-2e^-2x and set it equal to 0 but that's where I got stuck. How would you solve for x? I know that the answer is (ln2)/3 but how would you get there? Thanks.
 
Physics news on Phys.org
Working out the equation, and use some logarithm properties.

Apply natural logaritm

(e^{x})^{3} = 2
 
Stupid question...but why to the exponent of 3?
 
0= e^x-\frac{2}{e^{2x}}

Just swing that fraction to the other side and multiply out.
 
I can't believe I didn't get that...thanks.
 

Similar threads

  • · Replies 9 ·
Replies
9
Views
578
Replies
8
Views
4K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 5 ·
Replies
5
Views
912
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K