Textbook Question
Let A = {-6, -12⁄4, -5⁄8, -√3, 0, ¼, 1, 2π, 3, √12}. List all the elements of A that belong to each set. Whole numbers
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0. Review of College Algebra
Functions
2:18 minutesProblem 34
Textbook Question
Let A = {-6, -12⁄4, -5⁄8, -√3, 0, ¼, 1, 2π, 3, √12}. List all the elements of A that belong to each set. Real numbers
Verified step by step guidance1
Recall that the set of real numbers includes all rational and irrational numbers, including integers, fractions, and irrational roots, but excludes complex numbers with imaginary parts.
Examine each element of the set \(A = \{-6, -\frac{12}{4}, -\frac{5}{8}, -\sqrt{3}, 0, \frac{1}{4}, 1, 2\pi, 3, \sqrt{12}\}\) to determine if it is a real number.
Note that \(-6\) is an integer, so it is a real number.
Simplify \(-\frac{12}{4}\) to \(-3\), which is an integer and thus a real number.
Recognize that \(-\frac{5}{8}\) is a rational number (a fraction), so it is real.
Understand that \(-\sqrt{3}\) is an irrational number (since \(\sqrt{3}\) is irrational), but still a real number.
Note that \$0$ is a real number.
Recognize that \(\frac{1}{4}\) is a rational number, so it is real.
Note that \$1$ is an integer and thus real.
Understand that \(2\pi\) is a real number because \(\pi\) is irrational but real, and multiplying by 2 keeps it real.
Note that \$3$ is an integer and real.
Simplify \(\sqrt{12}\) to \(2\sqrt{3}\), which is irrational but real.
Conclude that all elements in set \(A\) are real numbers.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Real Numbers
Real numbers include all rational and irrational numbers, encompassing integers, fractions, decimals, and roots. They can be represented on the number line and do not include imaginary or complex numbers. Understanding this set helps identify which elements from a given list are real.
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Introduction to Complex Numbers
Rational and Irrational Numbers
Rational numbers can be expressed as a fraction of two integers, while irrational numbers cannot be written as simple fractions and have non-repeating, non-terminating decimals. Recognizing these helps classify elements like -5/8 (rational) and -√3 (irrational) within the real numbers.
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Simplification of Expressions
Simplifying expressions such as fractions and roots is essential to accurately identify and compare numbers. For example, -12/4 simplifies to -3, and √12 simplifies to 2√3, aiding in clearer classification within sets like real numbers.
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