(5x^3+2xy6^4+6xy)

To simplify the expression (5x^3 + 2xy6^4 + 6xy), we should combine like terms.

First, let's look at the terms involving x. We have 5x^3 and 2xy6^4. Since they have the same variable (x), we can combine them by adding the coefficients. The coefficient of x^3 is 5, and the coefficient of xy6^4 is 2y6^4. So, the simplified x term becomes 5x^3 + 2xy6^4.

Now, let's look at the constant terms. We have 6xy. Since they have the same variables (x and y), we can combine them by adding the coefficients. The coefficient of xy is 6. So, the simplified constant term becomes 6xy.

Now, we can put the simplified x term and the constant term together to get the final simplified expression: 5x^3 + 2xy6^4 + 6xy.