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Alyssagolly
@Alyssagolly
April 2019
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(5-7x)*2au carré -(x+2)(x-1)
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(5 - 7x)² - (x + 2)(x - 1)
= 25 - 70x + 49x² - (x² - x + 2x - 2)
= 25 - 70x + 49x² - x² + x - 2x + 2
= 48x² - 71x + 27
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= 25 - 70x + 49x² - (x² - x + 2x - 2)
= 25 - 70x + 49x² - x² + x - 2x + 2
= 48x² - 71x + 27