# Maths Algebraic Expressions part 19 (Questions 1: Identities) CBSE Class 8 Mathematics VIII | Summary and Q&A

14.0K views
February 8, 2017
by
LearnoHub - Class 11, 12
Maths Algebraic Expressions part 19 (Questions 1: Identities) CBSE Class 8 Mathematics VIII

## TL;DR

This video demonstrates how to use standard identities to simplify algebraic expressions and solve equations.

## Key Insights

• 😑 Standard identities, such as (a-b)(a+b) and (a^2-b^2), can be used to simplify algebraic expressions.
• 🍉 The special identity (X+a)(X+b) = X^2 + aX + bX + ab is useful when one term of the binomial is the same, but the other term is different.
• 😑 Understanding and applying these identities can help simplify complex algebraic equations and expressions.
• 😒 The video emphasizes the importance of practicing and understanding the concept to effectively use standard identities.

## Transcript

he'll open this video on algebraic expressions part 19 is brought to you by example.com normal co-come exam now we will look at some questions and we will see how to relate use of standard identities to spoil algebraic equations and expressions using suitable identity to get each of the following products 1.1 m minus 0.4 into 1.1 m plus 0.4 so when... Read More

### Q: How can standard identities be used to simplify algebraic expressions?

Standard identities, such as the (a-b)(a+b) and (a^2-b^2) identities, can be used to simplify algebraic expressions by applying the relevant identity and solving the equation step by step.

### Q: What is the special identity mentioned in the video for multiplying binomials with one different term?

The special identity introduced is the (X+a)(X+b) = X^2 + aX + bX + ab, which is used when one term of the binomial is the same, but the other term is different.

### Q: Why is the special identity considered a simplified version of the standard identities?

The special identity is considered a simplified version of the standard identities because it can be derived from the standard identities by applying them to specific cases where one term of the binomial is the same.

### Q: How can the special identity be applied to simplify algebraic expressions?

By substituting the values of the variables into the special identity equation and simplifying the expression step by step, the algebraic expression can be simplified using the special identity.

## Summary & Key Takeaways

• The video explains the concept of using standard identities to simplify algebraic expressions by demonstrating examples.

• It specifically focuses on using identities like (a-b)(a+b) and (a^2-b^2) to simplify products.

• The video also introduces a special identity for multiplying binomials with one different term, which is not a part of the standard identities.