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Summary Factoring Polynomials
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Description: Techniques for factoring polynomials, factoring by grouping, and applications in solving equations.
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Chapter 11: Factoring PolynomialsFactoring polynomials is a critical skill in algebra that involves
breaking down a polynomial into simpler, multiplicative
components. This chapter covers various techniques for
factoring polynomials, including factoring by grouping and
applications of factoring in solving equations.
Techniques for Factoring Polynomials
Factoring is the process of expressing a polynomial as the
product of its factors. Common techniques include: -
- Factoring out the Greatest Common Factor (GCF):
Identifying and dividing each term by the largest factor
common to all terms. For instance, in \( 6x^2 + 12x \), the
GCF is \( 6x \), so it can be factored to \( 6x(x + 2) \).
- Factoring by grouping: Used for polynomials with four or
more terms, it involves grouping terms to find common
factors. For example, \( x^3 + x^2 + x + 1 \) can be
grouped and factored as \( (x^3 + x^2) + (x + 1) = x^2(x +
1) + 1(x + 1) = (x^2 + 1)(x + 1) \).
- Factoring trinomials: Decomposing a trinomial into the
product of two binomials. For a trinomial like \( x^2 + 5x +
6 \), the factors are \( (x + 2)(x + 3) \).
Factoring by Grouping
Factoring by grouping is particularly useful for polynomials that
are not easily factored using other methods. This involves
arranging the polynomial into groups that each have a common
factor, then factoring out these common factors.
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