4b^2 +8b+7=4 4b^2 +8b+7-4=4-4 4b^2 +8b+3=0 (2b )(2b ) ( +1)( +3)=0 (2 b+1) (2 b+3) = 0 Solve: (2 b+1) =0 2 b+1-1 =0-1 2b=-1 2b/2=-1/2 b=-1/2 Solve: (2 b+3) = 0 2 b+3-3 = 0-3 2b=-3 2b/2=-3/2 b=-3/2