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If f(x) = 2x² then f(3)-f(1) equals?
  1. 15
  2. 16
  3. 17
  4. None of these
Explanation

f(3) = 2 × 3² = 2 × 9 = 18  

f(1) = 2 × 1² = 2 × 1 = 2  

f(3) - f(1) = 18 - 2 = 16


Last verified on 09-05-2026

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