Sagot :
1. x^2-3x-28=0
(x-7)(x+4)
x-7=0 x+4=0
x= 7 x= -4
2. x^2-8x-33=0
(x-11)(x+3)
x-11=0 x+3=0
x= 11 x= -3
(x-7)(x+4)
x-7=0 x+4=0
x= 7 x= -4
2. x^2-8x-33=0
(x-11)(x+3)
x-11=0 x+3=0
x= 11 x= -3