Accedmychevron_right11thchevron_rightmathchevron_rightComplex Numberschevron_rightExercise 1.1

Theory

Multiplicative inverse

For z = a + bi (non-zero):

TEXT
z^{-1} = 1/z = (a-bi)/(a^2+b^2)

Why this works

Multiply numerator and denominator by the conjugate a - bi.