Question

Find the difference of (-4x2 - 5x3 - 2) - (8x3 + 3x - 9x2). Be sure to show all of your work in a neat and organized fashion.

Answer 1

5x^2-13x^3-3x-2

Answer 2

-30x-2

Answer 3

(-21x -2) - (27x - 18x)
(-21x -2) - (-9x)
-21x -9x -2
= -30x -2

Answer 4

First remove the brackets in the second term being careful to get the signs correct. This gives -8x^3 + -3x +9x^2. Then group like terms as follows:
(-5x^3 - 8x^3) + (9x^2 - 4x^2) - 3x -2.
-13x^3 + 5x^2 -3x -2