156k views
4 votes
LESSON: MULTIPLYING COMPLEX NUMBERS

multiply, write the answer in standard form.

(3-2i)(4+i)

1 Answer

3 votes

Answer:

12 - 5i - 2i²

Explanation:

When multiplying two brackets, multiply:

1. The 1st term in 1st bracket with 1st term in 2nd bracket.

2. The 1st term in 1st bracket with 2nd term in 2nd bracket.

3. The 2nd term in 1st bracket with 1st term in 2nd bracket.

4. The 2nd term in 1st bracket with 2nd term in 2nd bracket.

Remember that:

1. When two minuses are multiplied together within the brackets, they make a plus.

2. When one plus and one minus are multiplied together they make a minus.

(3-2i)(4+i) = 12 + 3i -8i - 2i²

= 12 - 5i - 2i²

User Weslee
by
8.4k points