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=
= 4 + 4
= 8
28) =
=
= 9 + 3 .3 + 3²
= 9 + 9 + 9
= 27
29) f (x) = (1 - x) (3x + 2)
= 3x + 2 - 3x² - 2x
= - 3x² + x + 2
f' (x) = - 6x + 1