Answer:
Step-by-step explanation:
2x^3 + 6x^2 - 5 - (9x^3 + 4x^2 - 8).....distribute the - thru the parenthesis
2x^3 + 6x^2 - 5 - 9x^3 - 4x^2 + 8.....combine like terms
-7x^3 + 2x^2 + 3 <===
