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A. (x-4)(x+1)= 0
x=4 / x=-1
a=4, b=-1
B. a+2=4+2=6
b+2=-1+2=1
C. a=6, b=1
(x-6)(x-1)=0
x^2-6x-x+6=0
x^2-7x+6=0