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-4x\left(x^{2}+4x+4\right)\left(x-3\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
\left(-4x^{3}-16x^{2}-16x\right)\left(x-3\right)
Use the distributive property to multiply -4x by x^{2}+4x+4.
-4x^{4}-4x^{3}+32x^{2}+48x
Use the distributive property to multiply -4x^{3}-16x^{2}-16x by x-3 and combine like terms.
-4x\left(x^{2}+4x+4\right)\left(x-3\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
\left(-4x^{3}-16x^{2}-16x\right)\left(x-3\right)
Use the distributive property to multiply -4x by x^{2}+4x+4.
-4x^{4}-4x^{3}+32x^{2}+48x
Use the distributive property to multiply -4x^{3}-16x^{2}-16x by x-3 and combine like terms.