X²-5x-36=0
x²+4x-9x-36=0
x(x+4)-9(x+4)=0
(x+4)(x-9)=0
x+4=0
x-9=0
x= -4
x= 9
x1= -4 ; x2= 9
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X²-5x-36=0
x²+4x-9x-36=0
x(x+4)-9(x+4)=0
(x+4)(x-9)=0
x+4=0
x-9=0
x= -4
x= 9
x1= -4 ; x2= 9