developpe l'expression E
E=(2x-7)²-(5-x)²
urgent svp
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E= (2x-7)² - (5-x)²
E= 4x² - 28x + 49 - (25 - 10x + x²)
E= 4x² - 28x + 49 - 25 + 10x - x²
E= 3x² -18x + 24
E = (2x - 7)² - (5 - x)²
E = (2x)² - 2 x 2x x (-7) + (-7)² - (5² - 2 x 5 x (x) + x²)
E = 4x² - 28x + 49 - (25 - 10x + x²)
E = 4x² - 28x + 49 - 25 + 10x - x²
E = 3x² - 18x + 24
Factorisation:
E = (2x - 7)² - (5 - x)²
E = (2x - 7 - (5 - x))(2x - 7 + (5x - x))
E = (2x - 7 - 5 + x)(2x - 7 + 5 - x)
E = (3x - 12)(x - 2)
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