0.5^2+3x-1

To simplify the expression \(0.5^2 + 3x - 1\), we first calculate \(0.5^2\).

\[ 0.5^2 = 0.25 \]

Now, we can rewrite the entire expression:

\[ 0.25 + 3x - 1 \]

Next, we combine the constants \(0.25\) and \(-1\):

\[ 0.25 - 1 = -0.75 \]

Thus, the simplified expression is:

\[ 3x - 0.75 \]

So, \(0.5^2 + 3x - 1 = 3x - 0.75\).