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bonjour

f (x) = 4 x² + 40 x + 98

α = - b / 2 a

α = - 40 /8 = - 5

β = 4 ( - 5)² + 40 * -5 + 98 = 100 - 200 + 98 = - 2

f (x) = 4 ( x + 5 )² - 2