Expanding is a fundamental process in algebra that involves simplifying an algebraic expression. It is done by multiplying out the terms and combining like terms, primarily to transform expressions into their polynomial form.

Understanding Expanding:

Expanding simplifies expressions by using the distributive property of multiplication over addition or subtraction.

It often converts a compact algebraic expression into a more extended polynomial form.

Process of Expanding:

To expand an expression, each term inside a bracket is multiplied by every other term in the other bracket(s).

Then, like terms (terms with the same variable and power) are combined to simplify the expression further.

Example:

To expand the expression (x + 2)²:

First, write it as (x + 2)(x + 2).

Then multiply each term in the first bracket by each term in the second bracket: x(x + 2) + 2(x + 2).

This results in x² + 2x + 2x + 4.

Combine like terms: x² + 4x + 4.

So, the expanded form of (x + 2)² is x² + 4x + 4.

Key Points to Remember:

Expanding is used to make certain types of algebraic manipulation and simplification possible.

It's a routine step in solving equations, simplifying expressions, and algebraic factorization.

Practical Applications:

Expanding expressions is used in solving algebraic equations, in calculus, and in various mathematical modeling scenarios.

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