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, which is called an imaginary number because there is no real number that satisfies this equation. For the complex number a + bi, a is called the real part, and b is called the imaginary part. This lesson is suitable for the AS and A level pupils and is written in a pupil friendly manner in order to help the students easily master the topic and go on to solve all of the relevant questions with ease and confidence.
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