# Griffiths Page 146: Understanding Binomial Expansion

• ehrenfest
In summary, the binomial expansion is a mathematical concept used to expand expressions with two terms raised to a power. The formula for binomial expansion is derived from the binomial theorem, and it has various applications in probability, statistics, calculus, genetics, finance, and physics. The formula can also be extended to more than two terms using the multinomial theorem.
ehrenfest
[SOLVED] Griffiths page 146

## Homework Statement

EDIT: sorry I realized I posted this in the wrong forum; someone can move it to the advanced physics forum if you want

On that page, Griffiths says "and then the binomial expansion yields" and I am not sure what binomial expansion he is talking about. On the next line how did he get the second approximate equality? How in the world did he get rid of the ( )^(-1/2) operation ?

## The Attempt at a Solution

Last edited:
Never mind. See equation 3.93.

## 1. What is the binomial expansion?

The binomial expansion is a mathematical concept that involves expanding an expression with two terms raised to a power. It is used to find the coefficients of a polynomial expression.

## 2. How is the binomial expansion formula derived?

The binomial expansion formula is derived using the binomial theorem, which states that for any positive integer n, the nth power of a binomial expression can be expanded into a sum of terms with coefficients determined by Pascal's triangle.

## 3. What is the purpose of the binomial expansion?

The binomial expansion is primarily used in probability and statistics to find the probability of a certain number of successes in a given number of trials. It is also used in calculus to find derivatives and integrals of binomial expressions.

## 4. What are the applications of binomial expansion in real life?

Binomial expansion has many applications in real life, such as in genetics to determine the likelihood of certain traits in offspring, in finance to calculate compound interest, and in physics to model projectile motion.

## 5. Can the binomial expansion formula be extended to more than two terms?

Yes, the binomial expansion formula can be extended to more than two terms using the multinomial theorem. This theorem allows for the expansion of expressions with any number of terms raised to a power.

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