Assessment and Learning in Knowledge Spaces (ALEKS) Practice Exam

Which of the following best describes polynomial equations?

1. Equations that only include whole numbers

2. Equations involving variables raised to positive integer powers

3. Equations that do not include variables

4. Equations expressed in fractional form

The correct answer is: Equations involving variables raised to positive integer powers

Polynomial equations are defined by the use of variables that are raised to positive integer powers. This definition captures the essential characteristics of polynomials, which are algebraic expressions that can have one or more terms. Each term in a polynomial consists of a coefficient and a variable raised to a non-negative integer exponent. In more detail, a polynomial can be expressed in the form \(a_n x^n + a_{n-1} x^{n-1} + \ldots + a_1 x + a_0\), where \(a_n, a_{n-1}, \ldots, a_0\) are coefficients (which can be real or complex numbers), \(x\) is the variable, and \(n\) is a non-negative integer. The powers of the variable must be non-negative integers for the expression to classify as a polynomial. This definition distinguishes polynomial equations from other types of mathematical expressions. For instance, an equation involving whole numbers alone would not include variable components, nor would it allow for different forms such as fractions or negative exponents. Therefore, the characteristic of involving variables raised to positive integer powers accurately captures what polynomial equations entail.