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Topic: Help Needed in math
Replies: 25   Last Post: May 2, 2014 6:01 PM

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quasi

Posts: 10,251
Registered: 7/15/05
Re: Help Needed in math
Posted: Apr 28, 2014 4:46 AM
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punisher wrote:
>
>Can someone help me solve this
>
>Find the largest values of the integer a for which ax^2-5x-3 is
>negative for all values of x.


Is it homework?

I'll give a few hints:

(1) Can the required value of a be positive? Can it be zero?

(2) Can you find the vertex coordinates in terms of a?

(3) As an alternative to (2), find the discriminant in
terms of a. How can it help?

quasi



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