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19. A factorization technique used for expressions like [tex]a^2 - b^2[/tex] is called factoring by:

Sagot :

The given expression [tex]\( a^2 - b^2 \)[/tex] can be factored using a specific technique that applies to the difference of squares. To factor this expression, follow these steps:

1. Recognize the Difference of Squares Form: The expression [tex]\( a^2 - b^2 \)[/tex] is a classic example of a difference of squares, where you have two squared terms separated by a minus sign.

2. Apply the Difference of Squares Formula: The formula for factoring the difference of squares is:
[tex]\[ a^2 - b^2 = (a - b)(a + b) \][/tex]

3. Factor the Expression:
- Start with the expression [tex]\( a^2 - b^2 \)[/tex].
- Use the difference of squares formula to rewrite this expression as:
[tex]\[ (a - b)(a + b) \][/tex]

So, the factorization technique used for expressions like [tex]\( a^2 - b^2 \)[/tex] is called factoring by Difference of Squares.