simplify (9x^3+2x^2-5x+4)-(5x^3-7x+4) show your steps.

Answer 1

combine like terms
... the signs in the 2 polynomial are reversed by the preceding minus

(9x^3 - 5x^3) + 2x^2 + (-5x + 7x) + (4 + 4)

Answer 2

Lose the (4 + 4)