Answer
-9$x^{2}$-x+16
Work Step by Step
The phrase "Subtract (9$x^{2}$+3x-4) from (2x+12)." can be translated to the expression: (2x+12)-(9$x^{2}$+3x-4)
Simplify:
(2x+12)-(9$x^{2}$+3x-4)
=2x+12-9$x^{2}$-3x+4
=-9$x^{2}$+2x-3x+12+4
=-9$x^{2}$-x+16