0
|
4607 Views
|
3 Replies
|
0 Total Likes
View groups...
Share
GROUPS:

# Give an example of a function when I have two intervals

Posted 9 years ago
 I was wondering if there's a widged that can help me calculate or form a function of when I know the two intervals. example: Create a function f(x) that has a postivie derivative interval (-1 , 0) and a negative derivative interval (0,1) f(x) = ? If there aint one, anyone who can give me a step by step solution cause I am completly lost on how to do it.
3 Replies
Sort By:
Posted 9 years ago
 Take, for instance  f(x) = - x^2 (you know the notation x^2 ? It means x squared, also known as x times x). You should be able to verify (without using Mathematica) that this function satisfies your condition. Otherwise you are in the wrong course.
Posted 9 years ago
 One way is with DSolveValue: DSolveValue[{f'[x] == Piecewise[{{1, -1 < x < 0}, {-1, 0 <= x < 1}}], f[0] == 0}, f[x], x] Plot[%, {x, -2, 2}] 
Posted 9 years ago
 Hi there!Thanks for the answer, but I'm not exactly sure what to do with those lines. I copied it into the Wolfram search bar and got a page up, would the answer to my question be the diffrential equation solution? The reason I'm asking is the fact that I can't actually write it like that in the online course I'm taking and I need a "normal" function and I don't know how to begin making one.