Flip subtraction to addition.
x + 3x + (−3) + 2x² + 8 + (−5x)
Combine like terms.
Remember that you cannot combine x and x².
−x + 2x² + 5
See the hint in part (a).
Remember that xy cannot be combined with x or y.
See the hints in part (a).
2x² + (−3y²) + 4xy + 30y + (−x) + (−14)
See the hints in part (a) and part (c).