bonjour,
M = 3 ( x + 5) - ( x - 8)²
M = ( 3 x + 15 ) - ( x² - 16 x + 64)
M = 3 x + 15 - x² + 16 x - 64
M = - x² + 19 x - 49
pour x = - 2
M = - ( -2)² + 19*-2 - 49 = - 4 - 38 - 49 = - 91
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bonjour,
M = 3 ( x + 5) - ( x - 8)²
M = ( 3 x + 15 ) - ( x² - 16 x + 64)
M = 3 x + 15 - x² + 16 x - 64
M = - x² + 19 x - 49
pour x = - 2
M = - ( -2)² + 19*-2 - 49 = - 4 - 38 - 49 = - 91