In Exercises 37–52, perform the indicated operations and write the result in standard form. √-64 - √-25
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1. Equations & Inequalities
The Imaginary Unit
Problem 47
Textbook Question
Perform the indicated operations and write the result in standard form. 48−6−−12
Verified step by step guidance1
Identify the expression to simplify: \(\frac{-6 - \sqrt{-12}}{48}\).
Recognize that the square root of a negative number involves imaginary numbers. Rewrite \(\sqrt{-12}\) as \(\sqrt{12} \times \sqrt{-1}\), which is \(\sqrt{12}i\).
Simplify \(\sqrt{12}\) by factoring it into \(\sqrt{4 \times 3}\), which equals \$2\sqrt{3}\(. So, \)\sqrt{-12} = 2\sqrt{3}i$.
Substitute back into the original expression: \(\frac{-6 - 2\sqrt{3}i}{48}\).
Separate the real and imaginary parts by dividing both terms in the numerator by 48: \(\frac{-6}{48} - \frac{2\sqrt{3}i}{48}\). Then simplify each fraction to write the expression in standard form \(a + bi\).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Complex Numbers and Imaginary Unit
Complex numbers include a real part and an imaginary part, where the imaginary unit 'i' is defined as √-1. Understanding how to express square roots of negative numbers using 'i' is essential for simplifying expressions like √-12.
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Simplifying Radicals
Simplifying radicals involves factoring the number inside the square root to extract perfect squares. For example, √12 can be simplified to 2√3, which helps in rewriting expressions in a simpler form before performing operations.
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Adding & Subtracting Unlike Radicals by Simplifying
Standard Form of a Complex Number
The standard form of a complex number is a + bi, where 'a' is the real part and 'b' is the coefficient of the imaginary part. Writing results in this form makes it easier to interpret and use complex numbers in further calculations.
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