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QuickM
@QuickM
April 2019
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Je comprends que dal vous pouvais m'aidez ? svp
2 est-il solution de l'équation 5x²- 3x + 7= 2x² + x + 11 ?
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Thomas1106
5x²- 3x + 7= 2x² + x + 11
5x
²
-2x²
-3x
-x
+7
-11
= 2x²
-2x²
+x
-x
+11
-11
3x
²-4x-4 = 0
Si x = 2
3x²-4x-4 = 3*(2)² - 4*(2) - 4 = 3*4 - 8 - 4 = 12 - 12 = 0
2 est bien solution de l'équation .
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5x²-2x²-3x-x+7-11 = 2x²-2x²+x-x+11-11
3x²-4x-4 = 0
Si x = 2
3x²-4x-4 = 3*(2)² - 4*(2) - 4 = 3*4 - 8 - 4 = 12 - 12 = 0
2 est bien solution de l'équation .