Need help on Standard Form

f(x)=ax^2+bx+c

I know the C is the y intercept
i know that if A is positive it opens up and if a is negative it opens down. So i need the bx

Question

Need help on Standard Form 

f(x)=ax^2+bx+c

I know the C is the y intercept
i know that if A is positive it opens up and if a is negative it opens down. So i need the bx

thesmartone · Answer

Also a can not equal to 0

anonymous · Answer

oh okay thats good to know thanks

thesmartone · Answer

And also b is used with a to find the vertex.

thesmartone · Answer

Because the vertex of a line = -b/2a

anonymous · Answer

huh sorry now i just got confused

asnaseer · Answer

This interactive graph of a quadratic equation might help you understand what happens as you vary each of "a", "b" and "c": https://www.desmos.com/calculator/j9ipa5mou9

anonymous · Answer

my dad says he thinks it has to do with width but hes not for sure is that right? 

@asnaseer i will look at it right now

thesmartone · Answer

Vertex in a line is|dw:1419780535109:dw|