# calculus help!

• Jun 28th 2006, 09:19 PM
bobby77
calculus help!
d(- 0.00000003*X6 0.00001*X5 - 0.0018*X4 0.1576*X3 - 7.5998*X2 201.2044*x - 2048.025)/dx = 0
• Jun 28th 2006, 10:46 PM
Rich B.
d(- 0.00000003*X6 0.00001*X5 - 0.0018*X4 0.1576*X3 - 7.5998*X2 201.2044*x - 2048.025)/dx = 0

Hi:

The expression, as written, appears to be the derivative of a 6th degree polynomial function. An example of Such a function is:

f(x) = 1.2x^6 + 7x^5 - x^4 + dx^3 - 0.414x^2 + 4x + 5

For simplicity, I have underscored each of the 7 terms given. The important thing to notice here is that every pair of consecutive terms is combined by way of + or - (e.g., 7x^5 - x^4 , 4x + 5 , etc.).

But your expression has no operation between - 0.00000003*X6 and 0.00001*X5, nor between 0.0018*X4 and 0.1576*X3.

I suggest that you should recheck the problem as was presented to you, looking for the missing operation signs as discussed above.

Regards,

Rich B.
• Jun 28th 2006, 10:50 PM
CaptainBlack
Quote:

Originally Posted by bobby77
d(- 0.00000003*X6 0.00001*X5 - 0.0018*X4 0.1576*X3 - 7.5998*X2 201.2044*x - 2048.025)/dx = 0

We will need the missing signs

RonL