Hallo pagi,mohon bantuannya teman makasih :) yang dicentang saja hehe

no b.
[tex]L = \int\limits^3_1 {( x^{3} - 9 x^{2} + 20x) } \, dx [/tex]
L = [ 1/4x^4 - 3x³ + 10x²] a = 3 b = 1
L = [1/4(3)^4 - 3(3)³ + 10(3)²] - [1/4(1)^4 - 3(1)³ + 10(1)²]
L = 81/4 - 81 + 90 - 1/4 + 3 - 10
L = 80/4 + 2
L = 20 + 2
L = 22 satuan luas