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x^2 +4x = 2x + 8
x^2 + 4x - 2x -8 = 0
x^2 + 2x - 8 = 0
( x + 4 ) ( x-2 ) = 0
x = -4 dan x = 2
intergral ( 2x+8 - ( x^2 +4x) dx dengan batas x =-4 dan x =2 sehingga didapat
-1/3 ( 8) - (4)+ 16 - ( 1/3(64) +8 -32)
= 12-8/3+24-64/3
=36-24
=12