Divide Complex Numbers Worksheet

Algebra 2
Real And Complex Numbers

Total questions - 6

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How Will This Worksheet on "Divide Complex Numbers" Benefit Your Student's Learning?

  • Helps students understand algebra better, especially using conjugates and simplifying expressions.
  • Sharpens problem-solving skills and logical thinking.
  • Essential for advanced math classes like calculus and linear algebra.
  • Improves accuracy and precision in calculations.
  • Encourages both analytical and creative thinking, useful in many areas beyond math.

How to Divide Complex Numbers?

  • Suppose we need to divide `\frac{a+bi}{c+di}`, where \( a+bi \) is the numerator and \( c+di \) is the denominator.
  • Multiply both the numerator and the denominator by the conjugate of the denominator, \( c-di \), to get `\frac{(a+bi)(c-di)}{(c+di)(c-di)}`.
  • The denominator \( (c+di)(c-di) \) simplifies to \( c^2 + d^2 \), since \( c^2 - (di)^2 = c^2 + d^2 \).
  • Expand the numerator to get \( (ac+bd) + (bc-ad)i \), then divide each term by the simplified denominator \( c^2+d^2 \) to get `\frac{ac+bd}{c^2+d^2} + \frac{bc-ad}{c^2+d^2}i`.

Solved Example

Q. Simplify 3i7i\frac{{-3i}}{{-7i}}\newline\newlineWrite your simplified answer in the form a+bia + bi.
Solution:
  1. Separate numbers and imaginary unit: Separate the numbers and imaginary unit.\newline 3i7i \frac{-3i}{-7i} can be written as 37×ii \frac{-3}{-7} \times \frac{i}{i} .
  2. Simplify fractions:\newline Simplify: 37ii \frac{-3}{-7} \cdot \frac{i}{i} \newline 37ii=371 \frac{-3}{-7} \cdot \frac{i}{i} = \frac{3}{7} \cdot 1
  3. Final simplification: Simplify 37×1 \frac{3}{7} \times 1 .\newline 37×1=37 \frac{3}{7} \times 1 = \frac{3}{7}
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About Worksheet

Algebra 2
Real And Complex Numbers

It involves multiplying the numerator and denominator by the complex conjugate of the denominator to eliminate the imaginary part. For example, to divide `\frac{a+bi}{c+di}`, multiply both by the conjugate \( c-di \), resulting in `\frac{(a+bi)(c-di)}{(c+di)(c-di)}`, which simplifies to `\frac{(ac+bd) + (bc-ad)i}{c^2+d^2}`. Separating the real and imaginary components, get `\frac{ac+bd}{c^2+d^2} + \frac{bc-ad}{c^2+d^2}i`. To practice this process, using a divide complex numbers worksheet and engaging in dividing complex numbers practice can help reinforce the steps and improve proficiency.

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