(0,4 + 1,6)²=

To solve \((0.4 + 1.6)^2\), first simplify the expression inside the parentheses:

\[ 0.4 + 1.6 = 2.0 \]

Now, square the result:

\[ (2.0)^2 = 4.0 \]

Therefore, \((0.4 + 1.6)^2 = 4.0\).