From 2bdb56cc054e50902db582a91f20596bdb00872c Mon Sep 17 00:00:00 2001 From: Andrew Lorimer Date: Tue, 26 Feb 2019 22:03:09 +1100 Subject: [PATCH] [spec] 4f - conjugate root theorem --- spec/complex.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/spec/complex.md b/spec/complex.md index d111921..959c241 100755 --- a/spec/complex.md +++ b/spec/complex.md @@ -110,6 +110,8 @@ $z^2+a^2=z^2-(ai)^2=(z+ai)(z-ai)$ ## Solving complex polynomials +Include $\pm$ for all solutions, including imaginary. + #### Dividing complex polynomials Dividing $P(z)$ by $D(z)$ gives quotient $Q(z)$ and remainder $R(z)$ such that: @@ -122,7 +124,7 @@ Let $\alpha \in \mathbb{C}$. Remainder of $P(z) \div (z - \alpha)$ is $P(\alpha) ## Conjugate root theorem -Let $P(z)$ be a polynomial with real coefficients. If $a+bi$ is a solution to $P(z)=0$, with $a, b \in \mathbb{R}$, the the conjugate $a-bi$ is also a solution. +If $a+bi$ is a solution to $P(z)=0$, with $a, b \in \mathbb{R}$, the the conjugate $a-bi$ is also a solution. ## Polar form -- 2.47.1