bonjour
f (x) = 5 + 7 x² + 8 x
f ' ( x ) = 14 x + 8
14 x + 8 = - 3
14 x = - 11
x = - 11 /14
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bonjour
f (x) = 5 + 7 x² + 8 x
f ' ( x ) = 14 x + 8
14 x + 8 = - 3
14 x = - 11
x = - 11 /14