# Determine if the Functions are Linearly Independent or Linearly Dependent | Summary and Q&A

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September 17, 2014
by
The Math Sorcerer
Determine if the Functions are Linearly Independent or Linearly Dependent

## TL;DR

Determine whether the functions 9 + x x and x^2 are linearly independent or dependent on the set of real numbers.

## Key Insights

• 😫 Linear independence or dependence of functions can be determined by setting a linear combination equal to zero for all values of x.
• 🍉 Equating the coefficients of the terms in the equation helps determine the values of the coefficients.
• 0️⃣ If all the coefficients are zero, the functions are linearly independent.
• 0️⃣ If not all the coefficients are zero, the functions are linearly dependent.
• 🈸 Linear independence or dependence is important in various mathematical applications, particularly in linear algebra.
• ❓ The concept of linear independence extends to vectors and matrices as well.
• 📼 The method used in the video can be applied to analyze the linear independence of any set of functions or vectors.

## Transcript

we're being asked if the functions 9 + x x and x^2 are linearly independent or linearly dependent on the set of real numbers solution we'll start by supposing we have what's called a linear combination of our three functions and that it's equal to zero so what is a linear combination well it's C sub 1 * 9 + x here C sub 1 is a number plus C sub 2 *... Read More

### Q: What does it mean for functions to be linearly independent or dependent?

Linearly independent functions are such that no combination of the functions can equal zero, except when all the coefficients are zero. Linearly dependent functions have at least one combination of the functions that equals zero using non-zero coefficients.

### Q: How do we test for linear dependence or independence?

We test for linear dependence or independence by setting a linear combination of the functions equal to zero for all values of x and analyzing the coefficients of the terms.

### Q: How are the coefficients determined to check for linear independence?

The coefficients are determined by equating the coefficients of the terms on both sides of the equation. If all the coefficients are zero, the functions are linearly independent. If not all the coefficients are zero, the functions are linearly dependent.

### Q: What happens if the coefficients are not all zero?

If the coefficients are not all zero, it indicates that there is a combination of the functions that equals zero using non-zero coefficients. This means the functions are linearly dependent.

## Summary & Key Takeaways

• The video discusses how to determine if three functions are linearly independent or dependent.

• A linear combination of the functions is set equal to zero for all values of x.

• By equating the coefficients of the terms, it is determined that all the coefficients are zero, indicating that the functions are linearly independent.