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# Differentiation c2 edexcel page 143 Watch

1. 2) Find the values of x which for f(x) is a decreasing function given that f(x) equals:

F) x+25/x
2. (Original post by Guccigirl)
2) Find the values of x which for f(x) is a decreasing function given that f(x) equals:

F) x+25/x

When is f(x) = x + (25/x) a decreasing function?

What have you done so far?
3. (Original post by Guccigirl)
2) Find the values of x which for f(x) is a decreasing function given that f(x) equals:

F) x+25/x
If is a decreasing function

Differentiate the equation and then solve the inequality
4. (Original post by Lunch_Box)

When is f(x) = x + (25/x) a decreasing function?

What have you done so far?
i have differentiated it so I got

f'(x)=1-25/x^2
5. (Original post by Guccigirl)
i have differentiated it
Then read what Robbie242 has posted

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