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fannyduch59
@fannyduch59
June 2021
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bonjour je n'arrive pas développer et réduire cette expression : x au carre - 16x + 64 - (3x+5) au carre pouvez vous m'aidez ?
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maudmarine
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Bonjour,
x² - 16x + 64 - (3x + 5)²
= x² - 16x + 64 - (9x² + 30x + 25)
= x² - 16x + 64 - 9x² - 30x - 25
= x² - 9x² - 16x - 30x + 64 - 25
= - 8x² - 46x + 39
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fannyduch59
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Verified answer
Bonjour,x² - 16x + 64 - (3x + 5)²
= x² - 16x + 64 - (9x² + 30x + 25)
= x² - 16x + 64 - 9x² - 30x - 25
= x² - 9x² - 16x - 30x + 64 - 25
= - 8x² - 46x + 39