\[\left( 2b + b^{2} \right)^{2} + b^{2}(5 - b)(5 + b) - 4b \cdot\]
\[\cdot \left( b^{2} - 3 \right) = 4b^{3} + 4b^{2} + b^{4} + b^{2} \cdot\]
\[\cdot \left( 25 - b^{2} \right) - 4b^{3} + 12b = b^{4} + 4b^{2} +\]
\[+ \ 12b + 25b^{2} - b^{4} = 29b^{2} + 12b.\]