Math Problem Statement

What is the result of dividing the complex number (3+2i) by (1-i)?

Solution

To divide the complex number 3+2i1i\frac{3 + 2i}{1 - i}, we use the method of multiplying both the numerator and the denominator by the conjugate of the denominator.

The conjugate of 1i1 - i is 1+i1 + i. Let's proceed step by step:

Step 1: Multiply numerator and denominator by the conjugate of the denominator.

3+2i1i×1+i1+i=(3+2i)(1+i)(1i)(1+i)\frac{3 + 2i}{1 - i} \times \frac{1 + i}{1 + i} = \frac{(3 + 2i)(1 + i)}{(1 - i)(1 + i)}

Step 2: Simplify the denominator.

(1i)(1+i)=12i2=1(1)=2(1 - i)(1 + i) = 1^2 - i^2 = 1 - (-1) = 2

Step 3: Multiply the numerators.

(3+2i)(1+i)=3(1)+3(i)+2i(1)+2i(i)(3 + 2i)(1 + i) = 3(1) + 3(i) + 2i(1) + 2i(i) =3+3i+2i+2i2=3+5i+2(1)=3+5i2=1+5i= 3 + 3i + 2i + 2i^2 = 3 + 5i + 2(-1) = 3 + 5i - 2 = 1 + 5i

Step 4: Combine the results.

1+5i2\frac{1 + 5i}{2}

Step 5: Write the result in standard form.

=12+52i= \frac{1}{2} + \frac{5}{2}i

Thus, the result of dividing 3+2i3 + 2i by 1i1 - i is: 12+52i\frac{1}{2} + \frac{5}{2}i

Would you like more details or explanations?

Here are 5 related questions:

  1. How do you multiply complex numbers in polar form?
  2. What is the significance of the conjugate in complex number division?
  3. How do you convert a complex number from Cartesian to polar form?
  4. Can you find the magnitude and argument of the complex number 3+2i3 + 2i?
  5. How do you solve equations involving complex numbers?

Tip: Always simplify complex number operations by using conjugates to eliminate imaginary parts from denominators.

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Algebra
Division of Complex Numbers

Formulas

Multiplying by the conjugate: \( z / w = z * \bar{w} / (w * \bar{w}) \)
Simplification of imaginary unit: \( i^2 = -1 \)

Theorems

Conjugate Theorem: Using the conjugate of a denominator to simplify division involving complex numbers

Suitable Grade Level

Grades 10-12