I am working on graphing Quadratic functions.

Algebra
Tutor: None Selected Time limit: 1 Day

I know that the standard for quadratic function is ax2+bx+c but I don't know how to find the vertex or how to find point. A problem you could help with is f(x)=-3x2-6x

Sep 26th, 2015

Thank you for the opportunity to help you with your question!

So you want to find the vertex of f(x)=-3x^2-6x : 

to find the vertex should derivate the function :

f'(x) =  -6x - 6  

so should we determinate the f '(x) = 0 so is :  x = -1 

 so we have  : f'(x) > 0 at  ]-infinity , -1]  and f'(x) < 0 at  [ -1 , + infinity[  

and : f(-1) = 9  

so : 

the vertex is the point  A(-1,9) 


if you don't understand something just ask please 


i glad to work with you each time you have any other question or assignment just  invite me i will give you the detailed answer ok 


Good luck 


Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 26th, 2015

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Sep 26th, 2015
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Sep 26th, 2015
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