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Jumlah akar p + q = - b
Hasilkali akar pq = c
Akar-akar baru x₁ = p - k, dan x₂ = q - k
Jumlah akar x₁ + x₂ = p + q - 2k = - b - 2k
Hasilkali akar x₁x₂ = pq - (p + q)k + k² = c + bk + k²
PK baru x² - (x₁ + x₂)x + x₁x₂ = 0
x² - (- b - 2k)x + c + bk + k² = 0
x² + (b + 2k)x + (c + bk + k²) = 0