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A = 1, B = 1, C = -6
x1+x2 = -B/A = 1
x1.x2 = C/A = -6
pers kuadrat yg akar akarnya (x1+4) dan (x2+4)
hasil jumlah
(x1+4)+(x2+4) = x1+x2+8 = 1 + 8 = 9
hasil kali
(x1+4)(x2+4) = x1.x2 + 4(x1+x2) +16
= -6 +4(1) +16 = 14
pers kuadrat baru
x^2 - (hasil jumlah)x + (hasil kali) = 0
x^2 - 9x + 14 = 0