To simplify the radical expression \(\sqrt{y^{17}}\), we can use the property of exponents that \(\sqrt{a^b} = a^{b/2}\). This means we can rewrite the expression inside the square root as an exponent divided by 2.
Step 1: Rewrite the Radical Expression
We start with the expression \( \sqrt{y^{17}} \). To simplify this, we can use the property of exponents that states \( \sqrt{a^b} = a^{\frac{b}{2}} \).
Step 2: Apply the Exponent Property
Applying this property, we rewrite the expression as:
\[
\sqrt{y^{17}} = y^{\frac{17}{2}}
\]
Step 3: Simplify the Exponent
The exponent \( \frac{17}{2} \) can be expressed as \( 8 + \frac{1}{2} \), which allows us to further simplify:
\[
y^{\frac{17}{2}} = y^8 \cdot y^{\frac{1}{2}} = y^8 \sqrt{y}
\]
Final Answer
Thus, the simplified form of the expression \( \sqrt{y^{17}} \) is:
\[
\boxed{y^8 \sqrt{y}}
\]