Math Problem Statement

Multiply and simplify the following complex numbers:

[(\pink{1-5i}) \cdot (\blue{3-2i})]

Solution

To multiply and simplify the given complex numbers (15i)(32i)(1 - 5i) \cdot (3 - 2i), we will use the distributive property, often referred to as the FOIL (First, Outer, Inner, Last) method when dealing with binomials.

Let's proceed step-by-step:

  1. First: Multiply the first terms from each binomial: 13=31 \cdot 3 = 3

  2. Outer: Multiply the outer terms: 1(2i)=2i1 \cdot (-2i) = -2i

  3. Inner: Multiply the inner terms: 5i3=15i-5i \cdot 3 = -15i

  4. Last: Multiply the last terms: 5i(2i)=10i2-5i \cdot (-2i) = 10i^2

Next, we simplify by combining like terms. But first, recall that i2=1i^2 = -1, so: 10i2=10(1)=1010i^2 = 10(-1) = -10

Now, let's add up all the terms: 32i15i103 - 2i - 15i - 10

Combine the real and imaginary parts: (310)+(2i15i)=717i(3 - 10) + (-2i - 15i) = -7 - 17i

Thus, the simplified result of multiplying (15i)(32i)(1 - 5i) \cdot (3 - 2i) is: 717i\boxed{-7 - 17i}

Would you like to see further details or have any questions?

Here are 5 related questions:

  1. How do you add and subtract complex numbers?
  2. What is the conjugate of a complex number, and how is it used in division?
  3. How do you find the modulus of a complex number?
  4. What is the polar form of a complex number?
  5. How do you multiply complex numbers in polar form?

Tip: Always remember that i2=1i^2 = -1. This is crucial for simplifying expressions involving complex numbers.

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Multiplication of Complex Numbers

Formulas

FOIL Method
Imaginary Unit Properties (i^2 = -1)

Theorems

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Suitable Grade Level

Advanced High School