์‚ผ์ฐจ๋ฐฉ์ •์‹ $ax^3+bx^2+cx+d=0$์—์„œ์˜ ๊ทผ๊ณผ ๊ณ„์ˆ˜์˜ ๊ด€๊ณ„

์‚ผ์ฐจ๋ฐฉ์ •์‹ $ax^3+bx^2+cx+d=0$์—์„œ ๊ทผ๊ณผ ๊ณ„์ˆ˜์˜ ๊ด€๊ณ„๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

(๋‹จ, ์‚ผ์ฐจ๋ฐฉ์ •์‹ $ax^3+bx^2+cx+d=0$์˜ ๊ทผ์€ $\alpha, \beta, \gamma$์ด๋‹ค.)

 

[1]

$\alpha+\beta+\gamma=-\frac{b}{a}$

 

[2]

$\alpha\beta+\beta\gamma+\gamma\alpha=\frac{c}{a}$

 

[3]

$\alpha\beta\gamma=-\frac{d}{a}$

 


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