How do you add or subtract complex numbers?

A complex number has the form a+bi. We call a the 'real' bit (ie. the bit on a regular number line) and b is the 'imaginary' bit.
To add or subtract complex numbers you just add the real bits of both together and the imaginary bits of both together. (You CAN'T add a real part to an imaginary part).
For example: what is (3+2i) + (5+4i)?
Real bits: 3+5=8
Imaginary bits: 2i+4i=6i
So the answer is 8+6i

CB
Answered by Chloe B. Maths tutor

4993 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

A curve has equation y = f(x) and passes through the point (4, 22). Given that f'(x) = 3x^2 - 3x^(1/2) - 7, use integration to find f(x), giving each term in its simplest form


How do I solve a quadratic equation?


How can I determine the characteristics of a curve on an x-y set of axis (eg. points of intersection, stationary points, area under graph)?


Solve for x: logx(25) = log5(x)


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences