Math Problem Statement

Multiply (2+3i) (1-4i)

Solution

To multiply the two complex numbers (2+3i)(2 + 3i) and (14i)(1 - 4i), we will use the distributive property (also known as the FOIL method).

(2+3i)(14i)=2(1)+2(4i)+3i(1)+3i(4i)(2 + 3i)(1 - 4i) = 2(1) + 2(-4i) + 3i(1) + 3i(-4i)

Now, calculate each term:

=28i+3i12i2= 2 - 8i + 3i - 12i^2

Since i2=1i^2 = -1, substitute that in:

=28i+3i12(1)= 2 - 8i + 3i - 12(-1)

=28i+3i+12= 2 - 8i + 3i + 12

Combine like terms:

=(2+12)+(8i+3i)= (2 + 12) + (-8i + 3i)

=145i= 14 - 5i

So, the product of (2+3i)(14i)(2 + 3i)(1 - 4i) is:

145i\boxed{14 - 5i}

Would you like a more detailed explanation or have any questions?

Here are 5 related questions to further expand your understanding:

  1. How do you multiply complex numbers using the FOIL method?
  2. What happens when you square a complex number like (a+bi)2(a + bi)^2?
  3. What is the significance of i2=1i^2 = -1 in complex numbers?
  4. How do you find the conjugate of a complex number?
  5. How can you represent complex numbers on a coordinate plane?

Tip: When multiplying complex numbers, always remember that i2=1i^2 = -1, which turns any imaginary square into a real negative number!

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Multiplication of Complex Numbers
Distributive Property

Formulas

(a+bi)(c+di) = ac + adi + bci + bdi^2
i^2 = -1

Theorems

Properties of Complex Numbers
Imaginary Unit (i) Properties

Suitable Grade Level

Grades 10-12