Math Problem Statement

Divide and express the result in standard form: 6 / (5 - i)

Solution

The problem provided is to divide 65i\frac{6}{5 - i} and express the result in standard form (which is the form a+bia + bi, where aa and bb are real numbers).

Step-by-Step Solution:

  1. To divide by a complex number, multiply both the numerator and denominator by the conjugate of the denominator. The conjugate of 5i5 - i is 5+i5 + i.

  2. Multiply the numerator and the denominator by 5+i5 + i:

65i×5+i5+i=6(5+i)(5i)(5+i)\frac{6}{5 - i} \times \frac{5 + i}{5 + i} = \frac{6(5 + i)}{(5 - i)(5 + i)}

  1. Simplify the denominator using the difference of squares formula: (5i)(5+i)=52i2=25(1)=25+1=26(5 - i)(5 + i) = 5^2 - i^2 = 25 - (-1) = 25 + 1 = 26

  2. Now, multiply the numerator: 6(5+i)=30+6i6(5 + i) = 30 + 6i

  3. Therefore, the expression becomes: 30+6i26=3026+6i26=1513+3i13\frac{30 + 6i}{26} = \frac{30}{26} + \frac{6i}{26} = \frac{15}{13} + \frac{3i}{13}

Final Answer:

The result in standard form is: 1513+3i13\frac{15}{13} + \frac{3i}{13}

Would you like further details or have any questions about the process? Here are some related questions to consider:

  1. What is the general process for dividing complex numbers?
  2. How do you find the conjugate of a complex number?
  3. Why do we multiply by the conjugate when dividing complex numbers?
  4. Can you generalize this division method to any two complex numbers?
  5. How would the process change if the denominator had both real and imaginary components?

Tip: When working with complex numbers, always simplify the denominator using the difference of squares when multiplying by the conjugate.

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Division
Conjugates

Formulas

Multiply by conjugate: (a + bi)(a - bi) = a^2 - b^2
Standard form of complex numbers: a + bi

Theorems

Conjugate Multiplication Theorem
Difference of Squares

Suitable Grade Level

Grades 10-12