Sagot :
a)forme c 2 solutins 1 et 5
b)forme a 1 solution 3
c)forme b 1 solution 6
d)forme b
ta forme B est bizarre il sagit surement de -x² + 6x - 5
a) f(x)=4-(x-3)² = 0 => (x-3)² = 4 => x - 3 = 2 ou x - 3 = -2
x = 5 x = 1
b) -x² + 6x - 5 = 4 => -x² + 6x - 9 = 0 => -(x² - 6x + 9) = 0 => (x-3)² = 0 => x = 3
c) -x² + 6x - 5 = -5 => -x² + 6x = 0 => -x(x - 6) = => x = 0 ou x = 6
d) -x² + 6x - 5 = 6x - 7 => -x² = -2 => x² = 2 => x = rac(2) ou -rac(2)