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Ch. 1 - Equations and Inequalities
Lial - College Algebra 13th Edition
Lial13th EditionCollege AlgebraISBN: 9780136881063Not the one you use?Change textbook
All textbooksLial 13th EditionCh. 1 - Equations and InequalitiesProblem 43a
Chapter 2, Problem 43a

Write each number in standard form a+bi. 10+ √-200 / 5

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1
Identify the expression given: \(\frac{10 + \sqrt{-200}}{5}\). Our goal is to write it in the form \(a + bi\), where \(a\) and \(b\) are real numbers.
Simplify the square root of the negative number: \(\sqrt{-200} = \sqrt{200} \cdot \sqrt{-1} = \sqrt{200}i\). Recall that \(\sqrt{-1} = i\).
Simplify \(\sqrt{200}\) by factoring it into perfect squares: \(\sqrt{200} = \sqrt{100 \times 2} = \sqrt{100} \times \sqrt{2} = 10\sqrt{2}\).
Rewrite the numerator using the simplification: \(10 + 10\sqrt{2}i\). Now the expression is \(\frac{10 + 10\sqrt{2}i}{5}\).
Divide both terms in the numerator by 5 separately: \(\frac{10}{5} + \frac{10\sqrt{2}i}{5} = 2 + 2\sqrt{2}i\). This is the 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 Standard Form

Complex numbers are expressed in the form a + bi, where a is the real part and b is the imaginary part. The imaginary unit i is defined as √-1. Writing a number in standard form means separating it into its real and imaginary components.
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Simplifying Square Roots of Negative Numbers

To simplify the square root of a negative number, factor out √-1 as i and simplify the remaining positive square root. For example, √-200 = √(200) * i = 10√2 * i. This step is essential to rewrite expressions involving imaginary numbers.
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Operations with Complex Numbers

When performing arithmetic with complex numbers, apply algebraic rules carefully, including distributing division across terms and combining like terms. Simplify fractions and separate real and imaginary parts to express the result in standard form a + bi.
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