a. x(x-5)=0
(x-5) =0
x = 5
et
x=0
S={0;5}
b. x(-3x+1)=0
-3x+1=0
x=1/3
S={0;1/3}
c. 4x^2-28x=0
x(4x-28) =0
4x-28=0
x=28/4=7
S={0;7}
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a. x(x-5)=0
(x-5) =0
x = 5
et
x=0
S={0;5}
b. x(-3x+1)=0
-3x+1=0
x=1/3
et
x=0
S={0;1/3}
c. 4x^2-28x=0
x(4x-28) =0
4x-28=0
x=28/4=7
et
x=0
S={0;7}