7b²-20b-3=0; b=(10±√(100+21))/7 ; b=3; b=-1/7; -(7b²-20b-3)=
-7 (b-3)*( b+1/7);
7b²-6b-1=0; b=(3±√(9+71))/7 ; b=1; b=-1/7;
7b²-6b-1=7*(b-1)(b+1/7)
-7 (b-3)*( b+1/7)/(7*(b-1)(b+1/7))
=(3-b)/(b-1)
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Answers & Comments
7b²-20b-3=0; b=(10±√(100+21))/7 ; b=3; b=-1/7; -(7b²-20b-3)=
-7 (b-3)*( b+1/7);
7b²-6b-1=0; b=(3±√(9+71))/7 ; b=1; b=-1/7;
7b²-6b-1=7*(b-1)(b+1/7)
-7 (b-3)*( b+1/7)/(7*(b-1)(b+1/7))
=(3-b)/(b-1)