Answer
$$3x^5 - 6x^3 + 9x + 2$$
Work Step by Step
Subtracting a polynomial means that you are adding the opposite of that polynomial. We can now rewrite the expression:
$$9x^5 - 3x^2 + 2x - 7 - 6x^5 - 3x^3 + 7x + 9$$
We can now group like terms together:
$$(9x^5 - 6x^5) + (- 3x^3 - 3x^3) + (2x + 7x) +(- 7 + 9)$$
Combine like terms:
$$3x^5 - 6x^3 + 9x + 2$$
