\[*\ + 24ab + \ *\]
\[24ab = 2 \cdot 12ab\]
\[1)\ 24ab = 2 \cdot 2a \cdot 6b\]
\[\Longrightarrow 4a^{2} + 24ab + 36b^{2} =\]
\[= (2a + 6b)^{2};\]
\[2)\ 24ab = 2 \cdot 6a \cdot 2b\]
\[\Longrightarrow 36a^{2} + 24ab + 4b^{2} =\]
\[= (6a + 2b)^{2}\text{.\ }\]
\[3)\ 24ab = 2 \cdot 3a \cdot 4b\]
\[\Longrightarrow 9a^{2} + 24ab + 16b^{2} =\]
\[= (3a + 4b)^{2}.\]
\[4)\ 24ab = 2 \cdot 4a \cdot 3b\]
\[\Longrightarrow 16a^{2} + 24ab + 9b^{2} =\]
\[= (4a + 3b)^{2}\text{.\ }\]
\[5)\ 24ab = 2 \cdot 12a \cdot b\]
\[\Longrightarrow 144a^{2} + 24ab + b^{2} =\]
\[= (12a + b)^{2}\text{.\ }\]
\[6)\ 24ab = 2 \cdot a \cdot 12b\]
\[\Longrightarrow a^{2} + 24ab + 144b^{2} =\]
\[= (a + 12b)^{2}.\]