D=169-168=1
x1=(13+1)/2=7
x2=(13-1)/2=6
a=-7, b=-7
x^2-13x+42=(x-7)(x-6)
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D=169-168=1
x1=(13+1)/2=7
x2=(13-1)/2=6
a=-7, b=-7
x^2-13x+42=(x-7)(x-6)