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f( 2 ) = 5 × 2² - 3× 2 + 5
f'( 2) =20 - 6 + 5
f( 2) = 19
yang dicari adalah f'( 2)
f'( 2 ) = 5 × 2² - 3 × ( -2 ) + 5
f' ( 2) = 20 + 6 + 5
f' ( f) = 31