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Sagot :

Bonsoir,

f(x) = (x - 4)² + 2x(x + 5) - 17
f(x) = (x² - 8x + 16) + (2x² + 10x) - 17
f(x) = x² + 2x² - 8x + 10x + 16 - 17
f(x) = 3x² + 2x - 1

f(x) = (3x - 1)(x + 1)
f(x) = 3x*x + 3x*1 - 1*x - 1*1
f(x) = 3x² + 3x - x - 1 
f(x) = 3x² + 2x - 1

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