Intervals of decrease and increase

[vervain]

Hey!

How exactly do I find the intervals of decrease and increase of F(x) = 1 / (4-t^2)
I know that I have to find F'(x) and then solve F'(x) = 0, but I keep doing it wrong!

Please help me <3

 

[Ishuda]

Hey!

How exactly do I find the intervals of decrease and increase of F(x) = 1 / (4-t^2)
I know that I have to find F'(x) and then solve F'(x) = 0, but I keep doing it wrong!

Please help me <3

What is F'(x)?

 

[stapel]

How exactly do I find the intervals of decrease and increase of F(x) = 1 / (4-t^2)

Find F'(x), set it equal to zero, and then solve. The next step will depend upon what tools you've been given. Have you learned about the Second Derivative Test, or not?

I know that I have to find F'(x) and then solve F'(x) = 0, but I keep doing it wrong!

Please reply showing what you've done so far, so we can try to find any errors. Thank you!