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81.
If f(x) = 2x - x², then what is value of f(x + 2) + f(x - 2) = ? at x = 0

- 8

- 4

8

4

- 8

$Given that f (x) = 2 x - x^{2} and f (x + 2) + f (x - 2) = ? at x = 0 f (x + 2) + f (x - 2) = 2 \times (x + 2) - {(x + 2)}^{2} + 2 \times (x - 2) - {(x - 2)}^{2} Putting x = 0 = 2 \times (0 + 2) - {(0 + 2)}^{2} + 2 \times (0 - 2) - {(0 - 2)}^{2} = 2 \times 2 - 2^{2} - 2 \times 2 - 2^{2} = - 8$