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Johann5348
@Johann5348
January 2021
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bonjour pourriez-vous m'aider à cette exercices merci beaucoup pour votre aide c'est urgent s'il vous plaît merci mille fois.
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maudmarine
Verified answer
Bonsoir,
B = 2x² - 5x + 3
a)
x = 2
B = 2x² - 5x + 3
B = 2 * 2² - 5 * 2 + 3
B = 2 * 4 - 10 + 3
B = 8 - 10 + 3
B = 8 + 3 - 10
B = 11 - 10
B = 1
b)
x = - 5
B = 2x² - 5x + 3
B = 2 * - 5² - 5 * - 5 + 3
B = 2 * 25 + 25 + 3
B = 50 + 25 + 3
B = 78
c)
x = 1,5
B = 2x² - 5x + 3
B = 2 * 1,5² - 5 * 1,5 + 3
B = 2 * 2,25 - 7,5 + 3
B = 4,5 - 7,5 + 3
B = 4,5 + 3 - 7,5
B = 7,5 - 7,5
B = 0
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Bonjours je voudrais savoir quelque chose : au 1er trimestre j'avais 11.15 de moyenne et au 2eme j'ai eu 7.85 de moyenne si au 3eme trimestre j'ai 10.00 de moyenne ou 11.00 de moyenne je peux passer en 3eme
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Verified answer
Bonsoir,B = 2x² - 5x + 3
a) x = 2
B = 2x² - 5x + 3
B = 2 * 2² - 5 * 2 + 3
B = 2 * 4 - 10 + 3
B = 8 - 10 + 3
B = 8 + 3 - 10
B = 11 - 10
B = 1
b) x = - 5
B = 2x² - 5x + 3
B = 2 * - 5² - 5 * - 5 + 3
B = 2 * 25 + 25 + 3
B = 50 + 25 + 3
B = 78
c) x = 1,5
B = 2x² - 5x + 3
B = 2 * 1,5² - 5 * 1,5 + 3
B = 2 * 2,25 - 7,5 + 3
B = 4,5 - 7,5 + 3
B = 4,5 + 3 - 7,5
B = 7,5 - 7,5
B = 0