Let f(x) =ax^(2) + bx + c and f(-1) lt 1...

Let `f(x) =ax^(2) + bx + c` and `f(-1) lt 1, f(1) gt -1, f(3) lt -4` and `a ne 0`, then

`a > 0`

`a<0`

sign of `a` cannot be defined

none of these

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