Answer
-7$x^{2}$+32x+17
Work Step by Step
The phrase "Subtract (3$x^{2}$-12x) from (-4$x^{2}$+20x+17)." can be translated to the expression: (-4$x^{2}$+20x+17)-(3$x^{2}$-12x)
Simplify:
(-4$x^{2}$+20x+17)-(3$x^{2}$-12x)
=-4$x^{2}$+20x+17-3$x^{2}$+12x
=-4$x^{2}$-3$x^{2}$+20x+12x+17
=-7$x^{2}$+32x+17
