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f(4) = 4 - 5.4
16 - 20
- 4
f(-2) = -2 - 5.-2
4 + 10
14
f(4) - f(-2) = -4-14
= -18
= 16 - 20
= -4
f (-2) = - 5 (-2)
= 4 + 10
= 14
f (4) - f (-2) = -4 - 14
= -18