Introduction to Complex Numbers (Edexcel A-Level Further Mathematics): Flashcards

$z = a + bi$

$-1$

$a$

$b$

Add real and imaginary parts separately

Subtract real and imaginary parts separately

Use distributive property and $i^2 = -1$

Multiply by conjugate of denominator

$a - bi$

$(ac - bd) + (ad + bc)i$