よん 方程 ほうてい しきじゃありませんでした
yonji hōteishikijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 四次方程式

1. It was not a quartic equation.; It wasn't a fourth-degree equation.

Past/Perfective
Negative
Polite
Terminal Form
Mathematics