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1/α + 1/β =
(α + β)/αβ
1/α + 1/β + 1/γ =
αβ + βγ + αγ/αβγ
1/α + 1/β + 1/γ + 1/δ =
αβγ + βγδ + γδα + δαβ/αβγδ
Roots of a Cubic Polynomial:
α + β + γ
-b/a
Roots of a Cubic Polynomial:
αβ + βγ +αγ
c/a
Roots of a Cubic Polynomial:
αβγ
-d/a
Roots of a Quartic Polynomial:
α + β + γ + δ
-b/a
Roots of a Quartic Polynomial:
αβ + αγ +αδ +βγ + βδ + γδ
c/a
Roots of a Quartic Polynomial:
αβγ + αβδ + αγδ + βγδ
-d/a
Roots of a Quartic Polynomial:
αβγδ
e/a
α² + β² =
(α + β)² - 2αβ
α² + β² + γ² =
(α + β + γ)² - 2(αβ + βγ + αγ)
α² + β² + γ² + δ² =
(α + β + γ + δ)² - 2(αβ + αγ + αδ + βγ + βδ + γδ)
α³ + β³ =
(α + β)³ - 3αβ(α + β)
α³ + β³ +γ³ =
(α + β + γ)³ - 3(α + β + γ)(αβ + βγ + αγ) + 3αβγ