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\left(-3\right)^{2}\left(\sqrt{4x+8}\right)^{2}
Expand \left(-3\sqrt{4x+8}\right)^{2}.
9\left(\sqrt{4x+8}\right)^{2}
Calculate -3 to the power of 2 and get 9.
9\left(4x+8\right)
Calculate \sqrt{4x+8} to the power of 2 and get 4x+8.
36x+72
Use the distributive property to multiply 9 by 4x+8.
\left(-3\right)^{2}\left(\sqrt{4x+8}\right)^{2}
Expand \left(-3\sqrt{4x+8}\right)^{2}.
9\left(\sqrt{4x+8}\right)^{2}
Calculate -3 to the power of 2 and get 9.
9\left(4x+8\right)
Calculate \sqrt{4x+8} to the power of 2 and get 4x+8.
36x+72
Use the distributive property to multiply 9 by 4x+8.