1.18x^2 + 6 + 4x - 15x^2 - 4 + 13x

2. 2x^2 + 8 - 4x + 3x - 6x^2 + 7

18x^2 + 6 + 4x - 15x^2 - 4 + 13x

3x^2 + 17x + 2

Now you try the second problem.

To simplify these expressions, we need to combine like terms.

1. 1.18x^2 + 6 + 4x - 15x^2 - 4 + 13x

Combining the x^2 terms, we have (1.18x^2 - 15x^2). Simplifying this gives us -13.82x^2.

Next, we combine the x terms, which are (4x + 13x), giving us 17x.

Finally, combining the constant terms gives us (6 - 4), which simplifies to 2.

Therefore, the simplified expression is -13.82x^2 + 17x + 2.

2. 2x^2 + 8 - 4x + 3x - 6x^2 + 7

Combining the x^2 terms, we have (2x^2 - 6x^2), which simplifies to -4x^2.

Next, we combine the x terms, which are (-4x + 3x), giving us -x.

Finally, combining the constant terms gives us (8 + 7), which simplifies to 15.

Therefore, the simplified expression is -4x^2 - x + 15.