Explications étape par étape:
a) S= 2y²+2y+y+1 - ( 6y² -10y + 3y - 5)
S = 2y² +3y +1 - 6y² +7y +5
S = -4y² +10y + 6
b) S = 2y(-2y +5) +6
c)pour y=5: S= (2×5)[(-2×5)+5] +6
S = 10×-5+6 = -44
pour y = -3: S = (2×-3)[(-2×-3)+5]+6
S = -6 × 11 +6 = -60
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Explications étape par étape:
a) S= 2y²+2y+y+1 - ( 6y² -10y + 3y - 5)
S = 2y² +3y +1 - 6y² +7y +5
S = -4y² +10y + 6
b) S = 2y(-2y +5) +6
c)pour y=5: S= (2×5)[(-2×5)+5] +6
S = 10×-5+6 = -44
pour y = -3: S = (2×-3)[(-2×-3)+5]+6
S = -6 × 11 +6 = -60