4.9 Review and Summary

Additional Information

Access these online video resources for additional instruction and practice with factoring polynomials.

Key Equations

Perfect square trinomial [latex]\left(x+a\right)^2=\left(x+a\right)\left(x+a\right)=x^2+2ax+a^2[/latex]
[latex]a^2+2ab+b^2=\left(a+b\right)^2[/latex]
Difference of squares [latex]\left(a+b\right)\left(a-b\right)=a^2-b^2[/latex]
[latex]a^2-b^2=\left(a+b\right)\left(a-b\right)[/latex]
Sum of cubes [latex]a^3+b^3=\left(a+b\right)\left(a^2-ab+b^2\right)[/latex]
Difference of cubes [latex]a^3-b^3=\left(a-b\right)\left(a^2+ab+b^2\right)[/latex]

Key Terms

Binomial – a polynomial containing two terms

Coefficient – any real number [latex]a_i[/latex] in a polynomial in the form [latex]a_nx^n+...+a_2x^2+a_1x+a_0[/latex]

Difference of Squares – the binomial that results when a binomial is multiplied by a binomial with the same terms, but the opposite sign

Distributive Property – the product of a factor times a sum is the sum of the factor times each term in the sum; in symbols, [latex]a⋅(b+c)=a⋅b+a⋅c[/latex]

Factor by Grouping – a method for factoring a trinomial in the form [latex]ax^2+bx+c[/latex] by dividing the x term into the sum of two terms, factoring each portion of the expression separately, and then factoring out the GCF of the entire expression

Greatest Common Factor – the largest polynomial that divides evenly into each polynomial

Leading Coefficient – the coefficient of the leading term

Leading Term – the term containing the highest degree

Perfect Square Trinomial – the trinomial that results when a binomial is squared

Trinomial – a polynomial containing three terms

Key Concepts

Access for free at https://openstax.org/books/algebra-and-trigonometry/pages/1-introduction-to-prerequisites

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Math 3080 Preparation Copyright © 2022 by Erin Kox is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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