First we note symmetry in the expression's coefficients. We also note that 7*3=21, and 7+3=10.
From the rational roots theorem, we are tempted to try with 3 and 7 as coefficients of the factors.
Try (7b+3)(3b+7)=21b^2+(49+9)b+21 By switching the sign of 3b+7 to 3b-7, we get the signs right, to check: (7b+3)(3b-7)=21b^2+(9-49)b-21=21b^2-40b-21 ....right!
