Construction d'une parabole - Second dégré 1ère Mathématiques


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Comment tracer une parabole du second degré ?

Un polynôme du second degré P(x) = ax² + bx + c admet au plus deux racines.
. Le nombre exact de ses racines est déterminé par le signe d'un expression notée ? qu'on appelle le discriminant. ? = b² - 4ac.
. Pour tout x appartenant à ]-? ; x1[ ?]x2 ; +?[, P(x) est de même signe que le coefficient a.

Comment faire un polynôme du second degré ?

x1 = (?b ? ?? ) / (2a) et x2 = (?b + ?? ) / (2a) ; - Si ? = 0, alors l'équation admet une solution réelle double notée x0.

Comment trouver x1 ?

La parabole est tournée « vers le haut » : pour tous points A et B appartenant à la parabole, le segment [AB] est situé au-dessus de cette courbe.
. Une fonction répondant à ces propriétés est dite convexe.
. La parabole est tournée « vers le bas ».










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