if aB=10 a+B=-7 then equation is
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a+b= -7
a= -7-b
ab=10
-7-b)b=10
-7b-b²=10
b²+7b+10=0
b²+2b+5b+10=0
b(b+2)+5(b+2)=0
(b+5)(b+2)=0
b= -5 or b= -2
if b= -5, a= -2
if b= -2, a= -5
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