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anonymous

  • 5 years ago

what is a minimum point?? i first thought it was the root, but apparently not :S

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  1. nowhereman
    • 5 years ago
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    It's the point where a function is minimal. So there it assumes no smaller value. This notion can be seen locally, so that in a neighbourhood of that point the function assumes no smaller value, or globally.

  2. anonymous
    • 5 years ago
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    so how do you work it out?

  3. nowhereman
    • 5 years ago
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    If you have a differentiable function in the real numbers, you can find the local minima by finding the points where the derivative is zero. Of course you still have to check them, for example by looking at the second derivative, to make sure they are not saddle points.

  4. anonymous
    • 5 years ago
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    but if you cant differentiate??? coz this is for C1 and we only learn to differentiate in C2 then is there another way of finding it ???

  5. nowhereman
    • 5 years ago
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    What class of functions do you have there?

  6. anonymous
    • 5 years ago
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    ??? class function? do you mean like grade?? coz that a level

  7. nowhereman
    • 5 years ago
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    No, I mean what kind of functions do you consider?

  8. anonymous
    • 5 years ago
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    what function :S i dont know what you mean

  9. nowhereman
    • 5 years ago
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    You want to find the minima of some functions, which functions are that?

  10. anonymous
    • 5 years ago
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    well, its state the coodinates of the minimum point on the graph of y-7x+6 that is the qs :S is that what you wanted?

  11. nowhereman
    • 5 years ago
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    Do you mean y = 7x+6 ?

  12. anonymous
    • 5 years ago
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    soz its y=x^2-7x+6 soz i didnt know till you told me

  13. nowhereman
    • 5 years ago
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    Then you can see it algebraically by the method of completing the quadratic. Do you know that?

  14. nowhereman
    • 5 years ago
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    I mean, completing the square ^^

  15. anonymous
    • 5 years ago
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    thats it??? so whenever i see a qs like this its just completing the square??

  16. nowhereman
    • 5 years ago
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    Yes :-)

  17. anonymous
    • 5 years ago
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    thanks wait for the minimum do you always need 2 no.? and is there such thing as a maximum? coz i know there is when differentiation

  18. nowhereman
    • 5 years ago
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    If the parabola is the other way around there is no minimum and a maximum instead.

  19. anonymous
    • 5 years ago
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    ok thanks i still use completing the square to find it right thanks

  20. nowhereman
    • 5 years ago
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    yes, only you will have a minus sign in front of the square

  21. anonymous
    • 5 years ago
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    ok :)

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