-1+4x to the second power minus 6 + 7y to the second power + 5 + 6x to the third power - 4x to the third power.

Combine like terms

The given expression is:

-1 + 4x^2 - 6 + 7y^2 + 5 + 6x^3 - 4x^3

Combining the like terms, we have:

= (-1 - 6 + 5) + (4x^2) + (7y^2) + (6x^3 - 4x^3)

= -2 + 4x^2 + 7y^2 + 2x^3.

Hence, the combined expression is -2 + 4x^2 + 7y^2 + 2x^3.

To combine like terms, we need to simplify the expression by grouping terms with the same variable and exponent.

The given expression is:
-1 + 4x^2 - 6 + 7y^2 + 5 + 6x^3 - 4x^3

First, let's group the terms with the same variable and exponent:
-1 - 6 + 5 + 4x^2 + 7y^2 + 6x^3 - 4x^3

Next, let's combine the like terms:
(-1) + (-6) + 5 = -7
4x^2 - 4x^3
7y^2
6x^3

Therefore, the simplified expression with combined like terms is:
-7 + 4x^2 - 4x^3 + 7y^2 + 6x^3