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The table above shows the values of the quadratic function f for several ... ...

The table shows the values of the quadratic function f for several values of x. Which one of the following best represents f ?


(A)

f(x) = −2x2


(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set D: Functions

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Posted: 02/07/2012 11:02
Couldn't choice B be correct also? If you use f(0)=3 and you use it in the equation f(x)=x^2+3 then 0^2+3 = 3
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Posted: 11/25/2013 23:36
I don't understand either
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Posted: 11/25/2013 23:36
I got it
Contributor
 
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Posted: 02/07/2012 12:56
Kim, it is true that the function works for the value 0. However, it has to work for every x. If you plug in x=-1, for example, you get (-1)^2 + 3 = 4, not 1 as the f(x) value in the table. Hence, B cannot be correct.
 
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Posted: 01/19/2013 16:34
The best way to solve this problem is to simply PLUG IN NUMBERS.
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Posted: 11/25/2013 23:37
I got it
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