hasil int2gral..............

4/3x^3 - 12x^2 + 9x

= ( 4/3(2)^3 - 12(2)^2 + 9(2) ) - ( 4/3(-1)^3 - 12(-1)^2 + 9(-1) )
= (32/3 - 48 + 18) - (-4/3 -12 - 9)
= (32/3 - 30) - (-4/3 - 21)
= 36/3  -  9
= 12 - 9 = 3 (B)