# [SOLVED] SAT math 683 #14

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• Sep 28th 2008, 05:54 AM
fabxx
[SOLVED] SAT math 683 #14
Again, I am cramming the SAT math. Any helpful replies for my threads are greatly thanked and appreciated! Thanks

If the function f is defined by f(x)=x^2=bx+c, where b and c are positive constants, which of the following could be the graph of f?

I already eliminated a) and b) since i can tell from the function that a is positive so it has to be concave up. (a and b where both graphs which where concave down) (:

Thanks in advance

(Sorry for the sloppy graphs)
• Sep 28th 2008, 06:03 AM
Moo
Quote:

Originally Posted by fabxx
Again, I am cramming the SAT math. Any helpful replies for my threads are greatly thanked and appreciated! Thanks

If the function f is defined by f(x)=x^2=bx+c, where b and c are positive constants, which of the following could be the graph of f?

I already eliminated a) and b) since i can tell from the function that a is positive so it has to be concave up. (a and b where both graphs which where concave down) (:

Thanks in advance

(Sorry for the sloppy graphs)

The graphs are okay ;)

Think of the y intercept (that is to say when x=0)
f(0)=c, which is positive.
So you can eliminate one of the graphs.

After that, I don't know if you consider 0 as being positive, or if you can choose 2 graphs ;)
• Sep 28th 2008, 06:16 AM
fabxx
Thanks Moo!! You are veryyyyyyyyy helpful! (: