carboy4771 carboy4771
  • 22-10-2019
  • Mathematics
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2. Describe how to use the conjugate to divide 2 − i by 3 + 2i, and then find the quotient.

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boffeemadrid
boffeemadrid boffeemadrid
  • 22-10-2019

Answer:

[tex]\frac{4}{13}-\frac{7}{13}i[/tex]

Step-by-step explanation:

[tex]\frac{2-i}{3+2i}[/tex]

Multiply and divide by the conjugate.

The conjugate is the denominator with the sign of the complex number the opposite of the denominator.

[tex]\frac{2-i}{3+2i}\frac{3-2i}{3-2i}\\ =\frac{2\times (3-2i)-i\times (3-2i)}{3^2-(2i)^2}\\ =\frac{6-4i-3i+2i^2}{9+4}\\ =\frac{4-7i}{13}\\ =\frac{4}{13}-\frac{7}{13}i[/tex]

Quotient = [tex]\frac{4}{13}-\frac{7}{13}i[/tex]

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