Simplify the following polynomial expression. 3x( 4x+5) -4 (-x-3) (2x -5)

20x^2 +19x - 60

Step-by-step explanation:

3x( 4x+5) -4 (-x-3) (2x -5)

Distribute

12x^2 +15x - 4 (-x-3) (2x -5)

FOIL

12x^2 +15x - 4( -2x^2 -6x +5x +15)

12x^2 +15x - 4( -2x^2 -x +15)

Distribute

12x^2 +15x +8x^2 +4x -60

Combine like terms

20x^2 +19x - 60

answer: 12,000

step-by-step explanation: first you ar e supposed to add. then multiply then subtract

none of these

step-by-step explanation:

23 + 34 add up to 57 so just inform the teacher of this really stupid mistake