The given expression in the image is:

$3(3 - x)^4 - 7(3 - x)^2 + 9$

Would you like me to simplify or solve this expression for a specific value of $x$? Let me know what you'd like to do with this equation.

Here are 5 related questions to explore:

1. How can this expression be simplified using substitution?
2. How would you graph the function represented by this expression?
3. What are the possible real or complex roots of this expression?
4. How can we factor or expand this expression further?
5. What is the derivative of this expression with respect to $x$?

Tip:

When simplifying expressions with powers of binomials, try using substitution to make calculations easier, especially when the binomials are repeated.