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a = p, b = -(p + 2), dan c = 4 - p
x₁ + x₂ = -b/a = -(-(p+2)) / p = (p + 2) / p
x₁ . x₂ = c/a = (4 - p) / p
Mempunyai dua akar yang sama, maka x₁ = x₂
x₁ + x₂ = (p + 2) / p
x₂ + x₂ = (p + 2) / p
2x₂ = (p + 2) / p
x₂ = (p + 2) / 2p
x₁ . x₂ = (4 - p) / p
x₂ . x₂ = (4 - p) / p
x₂² = (4 - p) / p
[(p + 2) / 2p]² = (4 - p) / p
(p² + 4p + 4) / 4p² = (4 - p) / p
p(p² + 4p + 4) = 4p²(4 - p)
p³ + 4p² + 4p = 16p² - 4p³
5p³ - 12p² + 4p = 0
p(5p - 2)(p - 2) = 0
p = 0 atau p = 2/5 atau p = 2
Konstanta p = 2 dan 2/5
Jawaban : B