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x² - 4x - x + 3 + 1=0
x² - 5x + 4=0
(x - 1)(x - 4)=0
x=1, x=4
L=
=
=
= x³ + x² - 4x dengan batas 1 sampai 4
=( 4³ + 4² - 4×4) - ( 1³ + 1² - 4×1)
=( + -16) - ( + - 4)
=( + 24) - ( + - 4)
= + - + 24 + 4
= - + 28
= - +
=
=4 satuan luas