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**Christo****Guest**

The Front Face of a shampoo bottle is a parabola. The bottle is to have a height of 185mm and the length of the base is to be 70mm.

(a) Use the y-axis as the axis of symetry for the parabola and deveolp a rule which will produce a parabola to fit these requirements.

Can any1 help?

**Zmurf****Member**- Registered: 2005-07-31
- Posts: 49

The roots of the parabola must be -35 and 35 if the y axis is the axis of symetry.

b must equal Zero because the parabola is not shifted left or right. So that leaves us with the equation:

c is 185 because when an x value of 0 is subbed and a y value of 185 is subbed in c is denoted to be 185.

That leave us to find a.

Sub in 35, 0 zero for x and y values respectively and you will find a = -185/1225. Leaving us with the equation:

And it seems to work fin when I sub values in I havn't looked into simplifying it.

(Hurray I answered my first "Help Me!" on the forum )

*Last edited by Zmurf (2006-05-09 22:23:52)*

*"When subtracted from 180, the sum of the square-root of the two equal angles of an isocoles triangle squared will give the square-root of the remaining angle squared."*

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**Christo****Guest**

Thankyou so much!!!!

:):):)