What are complex numbers?

A complex number is a number made up of a real and imaginary part. 

CW

Related Maths A Level answers

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5Sin[x]-4=2Cos[2x]


Can you please explain how to expand two brackets, eg. (3x-7)(5x+6)


Why is there more than one solution to x^2 = 4?


Use the substitution u=3+(x+4)^1/2 to find the integral of 1/(3+(x+4)^1/2) dx between 0 and 5.