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Answered Oct 12, 2017
-7,because it has been verified also:
x2-(-7)x + 12=0
x2+7x +12=0
x2+4x +3x +12=0
x(x+4)+3(x+4)=0
(x+3)(x+4)=0
now,difference= -3-(-4)= -3+4=1
hence,verified
Answered Sep 16, 2017
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