# Key Concepts & Glossary

## Key Concepts

- Rational exponents can be rewritten several ways depending on what is most convenient for the problem. To solve, both sides of the equation are raised to a power that will render the exponent on the variable equal to 1.
- Factoring extends to higher-order polynomials when it involves factoring out the GCF or factoring by grouping.
- We can solve radical equations by isolating the radical and raising both sides of the equation to a power that matches the index.
- To solve absolute value equations, we need to write two equations, one for the positive value and one for the negative value.
- Equations in quadratic form are easy to spot, as the exponent on the first term is double the exponent on the second term and the third term is a constant. We may also see a binomial in place of the single variable. We use substitution to solve.
- Solving a rational equation may also lead to a quadratic equation or an equation in quadratic form.

## Glossary

**absolute value equation**an equation in which the variable appears in absolute value bars, typically with two solutions, one accounting for the positive expression and one for the negative expression

**equations in quadratic form**equations with a power other than 2 but with a middle term with an exponent that is one-half the exponent of the leading term

**extraneous solutions**any solutions obtained that are not valid in the original equation

**polynomial equation**an equation containing a string of terms including numerical coefficients and variables raised to whole-number exponents

**radical equation**an equation containing at least one radical term where the variable is part of the radicand

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### CC licensed content, Specific attribution

- College Algebra.
**Provided by:**OpenStax**Authored by:**OpenStax College Algebra.**Located at:**https://cnx.org/contents/[email protected]:1/Preface.**License:**CC BY: Attribution.