### Home > CAAC > Chapter 3 > Lesson 3.1.2 > Problem 3-15

3-15.

Flip subtraction to addition.

*x* + 3*x* + (−3) + 2*x*² + 8 + (−5*x*)

Combine like terms.

Remember that you cannot combine *x* and *x*².

−*x* + 2*x*² + 5

See the hint in part (a).

Remember that *xy* cannot be combined with *x* or *y*.

See the hints in part (a).

2*x*² + (−3*y*²) + 4*xy* + 30*y* + (−*x*) + (−14)

See the hints in part (a) and part (c).