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if a,b are the roots of $$x^2+px+q=0$$ , and g,d are the roots of $$x^2+px-r=0$$ , then (a-g)(a-d) is equal to
A q+r
B q-r
C -q-r
D -2(p+q+r)
E r-q
A q+r
B q-r
C -q-r
D -2(p+q+r)
E r-q
