find the laplace transform of this equation:

$4-4t+2{t}^{2}$

What I am doing:

$\frac{4}{s}-\frac{4}{{s}^{2}}+\frac{4}{{s}^{3}}$

$\frac{4{s}^{2}-4s}{{s}^{3}}+\frac{4}{{s}^{3}}$

$\frac{4{s}^{2}-4s+4}{s3}$

But I am getting the wrong answer, can you please tell me what I am doing wrong?

What I am doing:

But I am getting the wrong answer, can you please tell me what I am doing wrong?