f(x) =        x² +        x + 

x1 =  \frac{ -b +  \sqrt{ b² - 4ac }  }{2a } 

x2 =  \frac{ -b -  \sqrt{ b² - 4ac }  }{2a } 

Zéros

h =   \frac{ -b }{2a }   

k =  \frac{ 4ac - b² }{4a } 

Sommet

a = -7 (slider from -50 to 50, step 1)
b = 28 (slider from -50 to 50, step 1)
c = 2 (slider from -50 to 50, step 1)
texte3: b + ""
texte2: a + ""
texte4: c + ""
texte7: "x1 =  \frac{ - " + b + " +  \sqrt{ (" + b + ")² - 4(" + a + ")(" + c + ") }  }{2(" + a + ") }"
texte8: "x2 =  \frac{ - " + b + " -  \sqrt{ (" + b + ")² - 4(" + a + ")(" + c + ") }  }{2(" + a + ") }"
x1: (-b + sqrt(b^(2) - 4 * a * c)) / (2 * a)
x2: (-b - sqrt(b^(2) - 4 * a * c)) / (2 * a)
texte9 = FractionText(x1)
texte10: "x1 = " + x1 + " ou"
texte11: "x2 = " + x2 + " ou"
texte12 = FractionText(x2)
d = true
texte15: "h =  \frac{ - (" + b + ") }{2(" + a + ") }"
texte16: "k =  \frac{ 4(" + a + ")(" + c + ") - (" + b + ")² }{4(" + a + ") } "
h: (-b) / (2 * a)
k: (4 * a * c - b^(2)) / (4 * a)
texte18 = FractionText(h)
texte17: "h = " + h + " ou"
texte19: "k = " + k + " ou"
texte20 = FractionText(k)
texte21: "f(x) = " + a + "(x - " + h + ")² + " + k + ""
e = false