Factorise :
 
 \( 4x^3-20x^2+32x-16=\)
 
Answer:
Answer variants:
\((x+2)(x+2)(x+1)\)
\(4(x+2)(x+2)(x+1)\)
\(4(x-2)(x-2)(x-1)\)
\((x-2)(x-2)(x-1)\)