Complex Numbers




A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. No real number satisfies this equation, so i is called an imaginary number.
The following quiz has problems that require knowledge of complex numbers operations.





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5 - 6. If a and b are complex numbers and a = 2 + 5i, and b = 1 - 3i, calculate:

a + b =















a·b=
















7. Find the solutions of the quadratic equation: x2 - 2x + 2 = 0.


















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