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jadi daerah batasnya:
V(4x) = 2x-4
4x =4(x-2)^2
x= x^2 -4x +4
x^2 -5x +4 = 0
(x-4)(x-1)=0
x1= 1 , x2=4
A=integral(x^2 -5x +4 )= 1/3x^3 -5/2x^2 +4x...subtitusikan
={1/3(4)^3 - 5/2(4)^2 +4(3)}-{1/3(1)^3 - 5/2(1)^2 +4(1)} = -51/6 karena luas maka A= 51/6