Math Problem Statement
Find the multiplicative inverse of 32 modulo 97.
Solution
To find the multiplicative inverse of , we need to find an integer such that:
This can be done using the Extended Euclidean Algorithm, which helps solve equations of the form .
Since 32 and 97 are coprime (), there exists an inverse. Here's the process:
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Apply the Euclidean algorithm to find the greatest common divisor (gcd) of 32 and 97:
So, the gcd is , confirming that an inverse exists.
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Now, reverse the steps to express as a linear combination of and :
From , we can rearrange to:
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Thus, is the solution, but we need the inverse to be positive and in the range . To do this, add 97 to :
Therefore, the multiplicative inverse of is .
Would you like more details on how the Extended Euclidean Algorithm works, or do you have any other questions?
Here are 5 related questions for further exploration:
- What is the Euclidean Algorithm, and how is it used in finding gcd?
- How does the Extended Euclidean Algorithm differ from the standard Euclidean Algorithm?
- What is the importance of the multiplicative inverse in modular arithmetic?
- Can all numbers have multiplicative inverses modulo ?
- How would the process differ if the modulus was a composite number?
Tip: When finding an inverse, always ensure the number and modulus are coprime (gcd = 1), otherwise, an inverse does not exist.
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Math Problem Analysis
Mathematical Concepts
Modular Arithmetic
Number Theory
Formulas
32x ≡ 1 mod 97
ax + by = gcd(a, b)
Theorems
Extended Euclidean Algorithm
Greatest Common Divisor (GCD)
Suitable Grade Level
Grades 10-12
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