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Pasdepseudodu93
@Pasdepseudodu93
May 2019
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Bonjour, j'ai besoins d'aide:
On considère l'expression D=2x²-3x + 7 définie pour tout x∈R
1) Calculer D lorsque x = - 4
2)Calculer D lorsque x =
mercii
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Juulien
Verified answer
Bonjour,
D=2x²-3x+7
1) D=2*(-4)²-3*(-4)+7 = 2 * 16 + 12 + 7 = 32 + 12 + 7 = 51
2) D=2*(3/5)²-3*(3/5)+7 = 2 * 9/25 - 9/5 + 7 = 18/25 - 45/25 + 175/25 = 148/25
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gsantha
Verified answer
Bonsoir
D = 2x² - 3x + 7
1) pour x = -4
D = 2*(-4)² - 3*(-4) + 7
= 2*16 + 12 + 7
= 32 + 19
= 51
2) pour x = 3/5
D = 2*(3/5)² - 3*(3/5) + 7
= 2*(3²/5²) - (3*3)/5 + 7
= 2*(9/25) - 9/5 + 7
= (2*9)/25 - 9/5 + 7
= 18/25 - 9/5 + 7
= 18/25 - (9*5)/(5*5) + (7*25)/(1*25)
= 18/25 - 45/25 + 175/25
= (18-45+175)/25
= 148/25
Voilà j'espère avoir pu t'aider ^^
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Verified answer
Bonjour,D=2x²-3x+7
1) D=2*(-4)²-3*(-4)+7 = 2 * 16 + 12 + 7 = 32 + 12 + 7 = 51
2) D=2*(3/5)²-3*(3/5)+7 = 2 * 9/25 - 9/5 + 7 = 18/25 - 45/25 + 175/25 = 148/25
Verified answer
BonsoirD = 2x² - 3x + 7
1) pour x = -4
D = 2*(-4)² - 3*(-4) + 7
= 2*16 + 12 + 7
= 32 + 19
= 51
2) pour x = 3/5
D = 2*(3/5)² - 3*(3/5) + 7
= 2*(3²/5²) - (3*3)/5 + 7
= 2*(9/25) - 9/5 + 7
= (2*9)/25 - 9/5 + 7
= 18/25 - 9/5 + 7
= 18/25 - (9*5)/(5*5) + (7*25)/(1*25)
= 18/25 - 45/25 + 175/25
= (18-45+175)/25
= 148/25
Voilà j'espère avoir pu t'aider ^^