Find the sum.
(y^3 + x^2 + x) + (x^2 + x + 5) + (x^3 + 2x -1)
To find the sum, we can combine like terms in the expression.
First, let's group the terms with similar powers of x and y together:
(y^3) + (x^3) + (x^2 + x^2) + (x + 2x) + (x + 5 - 1)
Now, let's combine the like terms:
y^3 + x^3 + 2x^2 + 3x + 4
Therefore, the sum of the given expression is y^3 + x^3 + 2x^2 + 3x + 4.