What is y = x2 – 14x + 30 written in vertex form?
y = (x – 7)^2 + 30

y = (x – 7)^2 – 19

y = (x – 14)^2 + 37

y = (x – 14)^2 + 49

Y = (x - 7)^2 -19 
To get this: 
1.Complete the square : 
y = x^2 - 14x + 30 + 19 - 19 
y = (x^2 - 14x + 49) - 19 
y = (x-7)^2 -19

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