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= ( - b/a)² - 2. c/a
= (b/a)² - 2 . c/a
2. x1².x2 + x1.x2² = x1 . x2 ( x1 + x2)
= (c/a).(- b/a)
= - b.c / a²
3.α + β = - b/a
4.α - β = - (√D) / a
5.x1³x2 + x1.x2³ = x1 .x2 (x1² + x2²)
= (c/a){b/a)² - 2.c/a
, 6.
= -(b/a) / (c/a)
= - b/c
7.1pera+1perb =
8.bpera+aperb =