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9.3: Квадратична формула
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\(\begin{aligned}a x^{2}+b x+c&=0 \\ \color{black}{\frac{a x^{2}+b x+c}{\color{Cerulean}{a}}}&=\color{black}{\frac{0}{\color{Cerulean}{a}}} \quad\quad\quad \color{Cerulean}{Divide\:both\:sides\:by\:a.... $\begin{aligned}a x^{2}+b x+c&=0 \\ \color{black}{\frac{a x^{2}+b x+c}{\color{Cerulean}{a}}}&=\color{black}{\frac{0}{\color{Cerulean}{a}}} \quad\quad\quad \color{Cerulean}{Divide\:both\:sides\:by\:a.} \\ x^{2}+\frac{b}{a} x+\frac{c}{a}&=0 \quad\quad\quad\:\:\color{Cerulean}{Subtract \:\frac{c}{a}\:from\:both\:sides.} \\ x^{2}+\frac{b}{a} x&=-\frac{c}{a}\end{aligned}$