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akar-akarnya x₁ dan x₂
maka x₁³ + x₂³ = 117
(x₁ + x₂)³ - 3x₁x₂(x₁ + x₂) = 117
(3a/a)³ - 3(5a - 15)(3a/3) = 117
27 - 9(5a - 15) = 117
27 - 45a + 135 = 117
45a = 45
a = 1
maka nilai dari 2a + a³ = 2(1) + (1)³ = 3
2. lihat gambar