Signs of factors The trinomial x2 + bx + c factors to (x + m)(x + n). If b is negative and c is positive, what must be true about m and
n?
m and n are both positive
m is positive and n is negative
Om is negative and n is positive.
Om and n are both negative
Done

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