Understanding the Exponential Equation 2^(2x+y) = (4^x)(2^y)

  • Context: High School 
  • Thread starter Thread starter PsychStudent
  • Start date Start date
Click For Summary
SUMMARY

The equation 2^(2x+y) = (4^x)(2^y) simplifies correctly based on the properties of exponents. Specifically, the transformation utilizes the rule x^a * x^b = x^(a+b) and x^(ab) = (x^a)^b. For example, substituting x=3 and y=1 yields both sides equal to 128, confirming the validity of the equation. Understanding these exponent rules is crucial for solving similar exponential equations.

PREREQUISITES
  • Understanding of basic exponent rules, including x^a * x^b = x^(a+b)
  • Familiarity with the properties of exponential functions
  • Basic algebra skills for manipulating equations
  • Knowledge of variable substitution in mathematical expressions
NEXT STEPS
  • Study the properties of exponents in depth, focusing on rules like x^a * x^b = x^(a+b)
  • Explore exponential equations and their applications in algebra
  • Practice solving various exponential equations with different variable substitutions
  • Learn about logarithmic functions as they relate to exponentials
USEFUL FOR

Students and educators in mathematics, particularly those focusing on algebra and exponential functions, as well as anyone looking to strengthen their understanding of exponent rules and their applications in solving equations.

PsychStudent
Messages
9
Reaction score
0
Is 22x+y = 4x2y? If I substitute various digits into the x and y variables, it works, but I can't understand why. Can anyone please explain this to me?

For example, if we choose x=3 and y=1,
2(2)(3)+1 = 27 = 128
2(2)(3)+1 = 4321 = 64(2) = 128

Thanks
 
Mathematics news on Phys.org
It follows from the basic rules of combining exponents.

[tex]x^a x^b = x^{(a+b)}[/tex]

[tex]x^{ab} = (x^a)^b[/tex]
 
I can't believe I didn't figure that out. Thank you!
 

Similar threads

  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 18 ·
Replies
18
Views
5K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 19 ·
Replies
19
Views
2K
Replies
5
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K