Subtract: (3x2 − 8x + 3) − (−5x2 + 4x − 5)
8x2 − 12x + 8
−2x2 − 4x − 2
−2x2 − 12x + 8
8x2 − 4x − 2

(3x2 − 8x + 3) − (−5x2 + 4x − 5)=
3x2 − 8x + 3 + 5x2 - 4x + 5)=
8x²-12x + 8

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm