# Fast Algebra Trick - Multiply trinomials instantly! | Summary and Q&A

109.9K views
May 3, 2013
by
tecmath
Fast Algebra Trick - Multiply trinomials instantly!

## TL;DR

Learn a quick method to multiply trinomials together and check your answers.

## Key Insights

• ✖️ The video demonstrates a fast method to multiply trinomials using rainbow multiplication.
• 👾 Leaving appropriate spaces in the answer helps keep track of the terms.
• 😑 Checking the answer by substituting values into the expressions ensures accuracy.
• ✖️ This method can be extended to multiply other types of polynomials as well.
• 🎮 The video emphasizes the importance of practicing the technique for better understanding.
• 😑 Substituting different values into the expressions allows for further validation of the method.
• 🎮 The video encourages viewers to watch previous videos on multiplying binomials and trinomials for a better grasp of the concept.

## Transcript

good day and welcome to the tech math Channel what we're going to be having a look at in this video is a way of multiplying two trinomial numbers together really really fast okay so when this is actually uh third of a video where I've been looking at um third video where I've been looking at this sort of thing we first video we multiplying binomial... Read More

### Q: How can I quickly multiply two trinomial expressions?

To multiply two trinomials, you can use the rainbow multiplication technique and leave the correct number of spaces for the answer. By multiplying and adding the terms correctly, you can obtain the final answer efficiently.

### Q: What is rainbow multiplication?

Rainbow multiplication is a technique where you multiply the terms of one polynomial expression by the terms of another expression. You arrange the terms in a diagonal pattern, creating a "rainbow," and then multiply and add the terms to get the result.

### Q: How can I check if my answer is correct?

You can check your answer by substituting a value into the original expressions and comparing the result with the calculated answer. If they match, your answer is correct.

### Q: Can I use this method for any type of polynomial multiplication?

Yes, this method can be used for multiplying any type of polynomials together. The video specifically covers trinomials, but the same principles and techniques can be applied to binomials or other types of polynomials.

## Summary & Key Takeaways

• The video explains a fast method to multiply two trinomial expressions.

• The method involves using rainbow multiplication and leaving appropriate spaces for the answer.

• The video provides an example and demonstrates step-by-step how to multiply and add the terms to obtain the final answer.