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If \(f(x)=ax^2-x,\) and \(f(4)=28,\) what is \(f(-2)?\)
(A) 1
(B) 2
(C) 4
(D) 8
(E) 10
[spoiler]OA=E[/spoiler]
Source: Manhattan GMAT
(A) 1
(B) 2
(C) 4
(D) 8
(E) 10
[spoiler]OA=E[/spoiler]
Source: Manhattan GMAT
