Complex Simplification
1. Problem: Simplify each complex fraction to its simplest form.
2. Simplify (3 - 6i)/3i:
- Multiply numerator and denominator by the conjugate of the denominator's imaginary part, which is -3i, to remove the imaginary unit from the denominator:
$$\frac{3-6i}{3i} \times \frac{-i}{-i} = \frac{(3-6i)(-i)}{3i(-i)}$$
- Calculate numerator:
$$(3)(-i) - (6i)(-i) = -3i + 6i^2 = -3i + 6(-1) = -3i - 6$$
- Calculate denominator:
$$3i \times -i = -3i^2 = -3(-1) = 3$$
- Now fraction is:
$$\frac{-3i - 6}{3} = \frac{-6}{3} + \frac{-3i}{3} = -2 - i$$
3. Simplify 50/(4 - 3i):
- Multiply numerator and denominator by the conjugate of the denominator:
$$\frac{50}{4-3i} \times \frac{4+3i}{4+3i} = \frac{50(4+3i)}{(4)^2 - (3i)^2}$$
- Calculate denominator:
$$16 - 9i^2 = 16 - 9(-1) = 16 + 9 = 25$$
- Calculate numerator:
$$50 \times 4 + 50 \times 3i = 200 + 150i$$
- Final simplified form:
$$\frac{200 + 150i}{25} = 8 + 6i$$
4. Simplify (2 - i)/(3 - i):
- Multiply numerator and denominator by the conjugate of the denominator:
$$\frac{2 - i}{3 - i} \times \frac{3 + i}{3 + i} = \frac{(2 - i)(3 + i)}{(3)^2 - (i)^2}$$
- Calculate denominator:
$$9 - (-1) = 10$$
- Calculate numerator:
$$(2)(3) + (2)(i) - (i)(3) - (i)(i) = 6 + 2i - 3i - (-1) = 6 - i + 1 = 7 - i$$
- Final simplified form:
$$\frac{7 - i}{10} = \frac{7}{10} - \frac{1}{10}i$$
Answer:
(a) $-2 - i$
(b) $8 + 6i$
(c) $\frac{7}{10} - \frac{1}{10}i$