bonjour
y = 2 x² + 6 x
y ( -2) = 2 ( -2 )² + 6 *-2 = 4 - 12 = - 8
y ( - 1.5 ) = 2 ( - 1.5 )² + 6 * - 1.5 = 4.5 - 9 = - 4.5
tu continues de 0.5 en 0.5 , il suffit de remplacer x
M ( 0.4 ) = 2 ( 0.4 )² + 6 * 0.4 = 0.32 + 2.4 = 2.72 donc M ∈ C
4. y (0.3 ) = 2 *0.3² + 6 *0.3 = 1.98
2 x² + 6 x = 0
2 x ( x + 3 ) = 0
x = 0 et - 3
