1. ## Derivate questions

1)
Given

(a) 0
(b) 5
(c) - 5

All the answers MUST be points:

Thank you

2. ## Re: Derivate question

First of all, calculate $f'(x)$. How can you use this to find the answers?

3. ## Re: Derivate question

Originally Posted by danicloud

Given at which point will the curve have slope:

(a) 0
(b) 5
(c) - 5

All the answers MUST be points:

Thank you
Solve f'(x) = 0.

Solve f'(x) = 5.

Solve f'(x) = -5.

I hope you understand that f'(x) is the derivative of f(x) with respect to x. Remember to get the y-coordinate after you have found the value of x (use y = f(x)).

If you need more help, please show all your work and say where you're stuck.

4. ## Re: Derivate question

Thank you i got that but i am still stuck.

I found that the derivate is 12x-30. When i set it equal to 0 i get 5/2, which i substitute for x and get -73/2. Same thing for 5 and -5. However is still gives me a error

5. ## Re: Derivate question

Originally Posted by danicloud
Thank you i got that but i am still stuck.

I found that the derivate is 12x-30. When i set it equal to 0 i get 5/2, which i substitute for x and get -73/2. Same thing for 5 and -5. However is still gives me a error

However, you have not shown any working for the other two parts so it's impossible to know what your trouble is. My previous reply said to show ALL working.

6. ## Re: Derivate question

sorry so for 5 i found it to be: (12/35,-10511/1225) while for -5: (25/12,-851/24).

The website marks the answer as wrong

7. ## Re: Derivate question

Originally Posted by danicloud
sorry so for 5 i found it to be: (12/35,-10511/1225) while for -5: (25/12,-851/24).

The website marks the answer as wrong
Your values for x are wrong. Type out every step you did in finding them (you will most likely see your error during the process - same error for both, by the way).