Question

Choose the correct simplification of (2x3 + x2 − 4x) − (9x3 − 3x2).

Answer 1

You start off by multiplying the second bracket by -1 to get rid of the bracket.
So,
(2x3 + x2 - 4x) - 9x3 + 3x2 =
2x3 +x2 - 4x - 9x3 + 3x2 =
(2x3 - 9x3) + (x2 + 3x2) - 4x =
-7x3 + 4x2 - 4x

Answer 2

is it A polynomial                                            i need to know for the testz