dmgcity
16.12.2021 •
Mathematics
DM de décembre 4ème
Exercice n°1:
Un train roule à 150km/h. Au bout d'une heure, il peut augmenter sa vitesse de 10% pendant 1 h 30min,
mais il doit ensuite la réduire de 20% pendant 2 h 30min.
Durant la dernière demi-heure il doit limiter sa vitesse à 100 km/h.
Quelle distance a-t-il parcourue ?
Exercice n°2 :
Les terrains et ont la même aire.
Le terrain (ABCD) est tel que : AD = 52 m: DC = 25 m et BC = 60 m. Le terrain est un carré.
Quel est celui qui a le plus grand périmètre ?
52
D
B
25
60
С
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Ответ:
The function that has two x-intercepts (0,0) and (4,0) is f(x) = x ( x - 4 )
Further explanationDiscriminant of quadratic equation ( ax² + bx + c = 0 ) could be calculated by using :
D = b² - 4 a cFrom the value of Discriminant , we know how many solutions the equation has by condition :
D < 0 → No Real Roots
D = 0 → One Real Root
D > 0 → Two Real Roots
Let us now tackle the problem!
If the function f(x) = ax² + bx + c has x - intercept at ( 0 , 0 ) , then:
If the function f(x) = ax² + bx + c has x - intercept at ( 4 , 0 ) , then:
From the above results it can be concluded that the function is
If a = 1 , then :
Learn moreSolving Quadratic Equations by Factoring : Determine the Discriminant : Formula of Quadratic Equations : Answer detailsGrade: High School
Subject: Mathematics
Chapter: Quadratic Equations
Keywords: Quadratic , Equation , Discriminant , Real , Number