Engineering Board Exam Reviewer · Complex Numbers: Operations · medium

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

1. 11+2i
2. 8-3i
3. 11-2i
4. 5+2i

Answer

A. 11+2i

Solution

8-4i+6i-3i2=8+2i+3=11+2i.

More Complex Numbers: Operations questions

1. Divide: 3+4i/1-2i
2. Find the absolute value (modulus) of 5-12i.
3. Find the complex conjugate of 6-8i, then multiply it by the original number.
4. Simplify: (2+3i)2
5. Simplify: i2001
6. Simplify: i15+i18
7. Add: (3+5i)+(2-7i)

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