If f(x) = x² + 2x then f(2) + f(- 2) equals?
- 7
- 8
- 9
- 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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