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If f(x) = x² + 2x then f(2) + f(- 2) equals?
  1. 7
  2. 8
  3. 9
  4. None of these
Explanation

If f(x) = x² + 2x then f(2) + f(-2) = 8

Solution:

Put x = 2 in f(x) = x² + 2x

f(2) = 2² + 2_2

f(2) = 4 + 4 = 8

Put x = -2 in f(x) = x² + 2x

f(-2) = (-2)² + 2_(-2)

f(-2) = 4 - 4 = 0

Now add both values

f(2) + f(-2) = 8 + 0 = 8


Last verified on 24-05-2026

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