formcanonique.py

Created by anaellebaecher

Created on March 01, 2023

822 Bytes


from math import *
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ID
(a+b)^2=a^2+b^2+2ab
(a-b)^2=a^2+b^2-2ab
(a+b)(a-b)=a^2-b^2
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forme canonique
f(x)=ax^2+bx+c
=a(x-alpha)^2+beta

alpha=-b/2a
beta=-b^2-4ac/4a
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extrenum
max -> a<0  /max\
min -> a>0  \min/
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ATTENTION
on fait un tableau de
signe seulement si c'est
une innéquation (<0;>0)
OU
si on veut connaitre le
signe dune expression
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delta=b^2-4ac

->si delta<0 (pas de sol)
->si delta=0 (1 sol)
x0=-b/2a
->si delta>0 (2 sols)
x1=-b-delta/2a
x2=-b+delta/2a
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equation de fraction
exemple:
  -3x^2-4x+7
  ----------
     2x=1
*valeur interdite:
  2x+1=0
  x=-1/2
*numérateur N(x):
  -3x^2-4x+7
  /on calcule delta/
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