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Formula
Judge the identity
Answer
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$ax ^{ 2 } +bx+c = 0$
$\begin{cases} a = 0 \\ b = 0 \\ c = 0 \end{cases}$
Find the unknown when the unknown is a rational number
$\color{#FF6800}{ a } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ + } \color{#FF6800}{ b } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ c } = \color{#FF6800}{ 0 }$
$ $ Compare the coefficients to form a system of equations $ $
$\begin{cases} \color{#FF6800}{ a } = \color{#FF6800}{ 0 } \\ \color{#FF6800}{ b } = \color{#FF6800}{ 0 } \\ \color{#FF6800}{ c } = \color{#FF6800}{ 0 } \end{cases}$
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