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Evaaaa13
@Evaaaa13
June 2021
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Bonjour j'ai besoin d'aide svp :)
Je pense a un nombre
Je lui soustrais 10
J'élève le tout au carré
Je soustraie au résultat le carré du nombre auquel j'ai pensé
J'obtiens alors: -340
Merci d'avance
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Quantum
Verified answer
Bonjour,
Ce problème revient à résoudre l'équation :
( x-10 )² - x² = -340
Identité remarquable :
( a-b )² = a² - 2ab + b²
Résolution :
( x-10 )² - x² = -340
x² - 20x + 100 - x² = -340
- 20x + 100 = -340
- 20x = -440
x = 22
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Verified answer
Bonjour,Ce problème revient à résoudre l'équation :
( x-10 )² - x² = -340
Identité remarquable :
( a-b )² = a² - 2ab + b²
Résolution :
( x-10 )² - x² = -340
x² - 20x + 100 - x² = -340
- 20x + 100 = -340
- 20x = -440
x = 22