12x^2+12x-48=0 /:12
x^2+x-4=0
D=1+4×4= 9
x1 =(-1+3)/2 =1
x2 =(-1-3)/2= -2
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12x^2+12x-48=0 /:12
x^2+x-4=0
D=1+4×4= 9
x1 =(-1+3)/2 =1
x2 =(-1-3)/2= -2