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y = x³-4x
0 = x(x²-4)
0 = x( (x-2)(x+2) )
x₁ = 0 (tidak dipakai karena nanti hasilnya 0 )
x₂ = 2
x3 = -2
L= ∫ x³-4x dx
L= (x pangkat 4) / 4 -2x²
L1 daerah x₂=2
L=( (2 pangkat 4) / 4) - 2×2²
= 4- 8
=-4
L2 daerah x3 = -2
= ( (-2 pangkat 4) / 4) -2 × (-2)²
= 4 - 8
=-4
L kurva = L1 + L2
=-4+ (-4) = -8 tetapi luas gak ada negatif jadiin positif ya = 8
semoga benar :)