Posted by **Magnus** on Thursday, March 19, 2009 at 2:35pm.

f(x)= - 2x^3 + 45x^2 -300x +9

There are 3 intervals (-inf,A], [A,B], [B, inf) where A and B are critical points.

Find A and B?

For each of the intervals is it decreasing or increasing??

I found the derivative which is -6x^2+90x-300

-6(x^2-15x +50)

(x-5)(x-10) so I thought the critical points would be 5 and 10 but thats not what my book says??

- calculus -
**Magnus**, Thursday, March 19, 2009 at 2:50pm
Nevermind I got it!

## Answer This Question

## Related Questions

- calculus - 8. f(x)= - 2x^3 + 45x^2 -300x +9 There are 3 intervals (-inf,A], [A,B...
- Calculus - Consider the function f(x)=-2x^3+33x^2-108x+2. For this function, ...
- CALCULUS - 6. f(x)= 12x^5 + 30x^4 - 160x^3 +4 For this function there are four ...
- calculus - Consider the function f (x)=x1=5(x��4). This function ...
- Calculus - Consider the function f(x)=4(x-5)^(2/3). For this function, there are...
- calculus help please - Consider the function f(x)=2x+9x^–1.? For this function ...
- math-calc - Consider the function f(x)= (2x+8)/(6x+3). For this function there ...
- Calculus (urgent!!) - Please answer the following questions about the function f...
- Calculus (pleas help!!!) - Please answer the following questions about the ...
- Calculus (pleas help!!!) - Please answer the following questions about the ...

More Related Questions