The expression you've provided is:

$16x^3 + 20x^2 + 4x + 5$

This is a cubic polynomial. Would you like to factor this, find its roots, or explore another operation?

Feel free to clarify your goal, but here are some ways to engage with this polynomial:

1. Factorization: Trying to express the polynomial as a product of simpler polynomials, if possible.
2. Find Roots: Using techniques like synthetic division, or applying the Rational Root Theorem to determine the roots.
3. Graphing: Understanding the behavior of the function visually.
4. Calculating the Derivative: Useful for finding critical points if this is part of a calculus problem.
5. Evaluating for Specific $x$ Values: Plugging in values for $x$ to find the corresponding output.

Follow-up Questions:

1. Would you like to attempt factoring this polynomial?
2. Are you interested in finding the roots of this cubic equation?
3. Would you like to find the derivative of this expression for calculus purposes?
4. Would you like to see how this polynomial behaves when graphed?
5. Should I simplify the polynomial for a particular value of $x$?

Tip:

When dealing with cubic polynomials, one way to start factoring is by checking for possible rational roots using the Rational Root Theorem!