Determine the LCM of the given polynomials:
Leave your answer in factored form.


x4+4x3\displaystyle {x}^{{4}}+{4}{x}^{{3}}
x216\displaystyle {x}^{{2}}-{16}
x3+8x2+16x\displaystyle {x}^{{3}}+{8}{x}^{{2}}+{16}{x}