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If f x = a x 2 + b x + c , f - 1 > 1 2 , f 1 < - 1 and f - 3 < - 1 2 , then

Options

  1. Aa = 0
  2. Ba < 0
  3. Ca > 0
  4. DSign of a can not be determined

Correct answer

B. a < 0

Step-by-step solution

Clearly, parabola is opening downwards ⇒ a < 0 .

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