Ch. 1 - Equations and Inequalities

Lial13th EditionCollege AlgebraISBN: 9780136881063당신이 사용하는 게 아니라요?교과서 변경

Lial 13th Edition

Ch. 1 - Equations and Inequalities

문제 43a

2장, 문제 43a

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

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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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주요 개념

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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.

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.

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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